jens@0: //
jens@0: //  TCPListener.m
jens@0: //  MYNetwork
jens@0: //
jens@0: //  Created by Jens Alfke on 5/10/08.
jens@0: //  Copyright 2008 Jens Alfke. All rights reserved.
jens@0: //  Portions based on TCPServer class from Apple's "CocoaEcho" sample code.
jens@0: 
jens@0: #import "TCPListener.h"
jens@0: #import "TCPConnection.h"
jens@0: 
jens@0: #import "ExceptionUtils.h"
jens@0: #import "IPAddress.h"
jens@0: #include <sys/socket.h>
jens@0: 
jens@0: #include <netinet/in.h>
jens@0: #include <unistd.h>
jens@0: 
jens@0: 
jens@0: static void TCPListenerAcceptCallBack(CFSocketRef socket, CFSocketCallBackType type, 
jens@0:                                       CFDataRef address, const void *data, void *info);
jens@0: 
jens@0: @interface TCPListener()
jens@0: @property BOOL bonjourPublished;
jens@0: @property NSInteger bonjourError;
jens@0: - (void) _updateTXTRecord;
jens@0: @end
jens@0: 
jens@0: 
jens@0: @implementation TCPListener
jens@0: 
jens@0: 
jens@0: - (id) initWithPort: (UInt16)port
jens@0: {
jens@0:     self = [super init];
jens@0:     if (self != nil) {
jens@0:         _port = port;
jens@0:     }
jens@0:     return self;
jens@0: }
jens@0: 
jens@0: 
jens@0: - (void) dealloc 
jens@0: {
jens@0:     [self close];
jens@0:     LogTo(TCP,@"DEALLOC %@",self);
jens@0:     [super dealloc];
jens@0: }
jens@0: 
jens@0: 
jens@0: @synthesize delegate=_delegate, port=_port, useIPv6=_useIPv6,
jens@0:             bonjourServiceType=_bonjourServiceType, bonjourServiceName=_bonjourServiceName,
jens@0:             bonjourPublished=_bonjourPublished, bonjourError=_bonjourError,
jens@0:             pickAvailablePort=_pickAvailablePort;
jens@0: 
jens@0: 
jens@0: - (NSString*) description
jens@0: {
jens@0:     return $sprintf(@"%@[port %hu]",self.class,_port);
jens@0: }
jens@0: 
jens@0: 
jens@0: // Stores the last error from CFSocketCreate or CFSocketSetAddress into *ouError.
jens@0: static void* getLastCFSocketError( NSError **outError ) {
jens@0:     if( outError )
jens@0:         *outError = [NSError errorWithDomain: NSPOSIXErrorDomain code: errno userInfo: nil];
jens@0:     return NULL;
jens@0: }
jens@0: 
jens@0: // Closes a socket (if it's not already NULL), and returns NULL to assign to it.
jens@0: static CFSocketRef closeSocket( CFSocketRef socket ) {
jens@0:     if( socket ) {
jens@0:         CFSocketInvalidate(socket);
jens@0:         CFRelease(socket);
jens@0:     }
jens@0:     return NULL;
jens@0: }
jens@0: 
jens@0: // opens a socket of a given protocol, either ipv4 or ipv6.
jens@0: - (CFSocketRef) _openProtocol: (SInt32) protocolFamily 
jens@0:                       address: (struct sockaddr*)address
jens@0:                         error: (NSError**)error
jens@0: {
jens@0:     CFSocketContext socketCtxt = {0, self, NULL, NULL, NULL};
jens@0:     CFSocketRef socket = CFSocketCreate(kCFAllocatorDefault, PF_INET, SOCK_STREAM, IPPROTO_TCP,
jens@0:                                         kCFSocketAcceptCallBack, &TCPListenerAcceptCallBack, &socketCtxt);
jens@0:     if( ! socket ) 
jens@0:         return getLastCFSocketError(error);   // CFSocketCreate leaves error code in errno
jens@0:     
jens@0:     int yes = 1;
jens@0:     setsockopt(CFSocketGetNative(socket), SOL_SOCKET, SO_REUSEADDR, (void *)&yes, sizeof(yes));
jens@0:     
jens@0:     NSData *addressData = [NSData dataWithBytes:address length:address->sa_len];
jens@0:     if (kCFSocketSuccess != CFSocketSetAddress(socket, (CFDataRef)addressData)) {
jens@0:         getLastCFSocketError(error);
jens@0:         return closeSocket(socket);
jens@0:     }
jens@0:     // set up the run loop source for the socket
jens@0:     CFRunLoopRef cfrl = CFRunLoopGetCurrent();
jens@0:     CFRunLoopSourceRef source = CFSocketCreateRunLoopSource(kCFAllocatorDefault, socket, 0);
jens@0:     CFRunLoopAddSource(cfrl, source, kCFRunLoopCommonModes);
jens@0:     CFRelease(source);
jens@0:     return socket;
jens@0: }
jens@0: 
jens@0: - (BOOL) _failedToOpen: (NSError*)error
jens@0: {
jens@0:     LogTo(TCP,@"%@ failed to open: %@",self,error);
jens@0:     [self tellDelegate: @selector(listener:failedToOpen:) withObject: error];
jens@0:     return NO;
jens@0: }
jens@0: 
jens@0: 
jens@0: - (BOOL) open: (NSError**)outError 
jens@0: {
jens@0:     // set up the IPv4 endpoint; if port is 0, this will cause the kernel to choose a port for us
jens@0:     do{
jens@0:         struct sockaddr_in addr4;
jens@0:         memset(&addr4, 0, sizeof(addr4));
jens@0:         addr4.sin_len = sizeof(addr4);
jens@0:         addr4.sin_family = AF_INET;
jens@0:         addr4.sin_port = htons(_port);
jens@0:         addr4.sin_addr.s_addr = htonl(INADDR_ANY);
jens@0: 
jens@0:         NSError *error;
jens@0:         _ipv4socket = [self _openProtocol: PF_INET address: (struct sockaddr*)&addr4 error: &error];
jens@0:         if( ! _ipv4socket ) {
jens@0:             if( error.code==EADDRINUSE && _pickAvailablePort && _port<0xFFFF ) {
jens@0:                 LogTo(BLIPVerbose,@"%@: port busy, trying %hu...",self,_port+1);
jens@0:                 self.port++;        // try the next port
jens@0:             } else {
jens@0:                 if( outError ) *outError = error;
jens@0:                 return [self _failedToOpen: error];
jens@0:             }
jens@0:         }
jens@0:     }while( ! _ipv4socket );
jens@0:     
jens@0:     if (0 == _port) {
jens@0:         // now that the binding was successful, we get the port number 
jens@0:         NSData *addr = [(NSData *)CFSocketCopyAddress(_ipv4socket) autorelease];
jens@0:         const struct sockaddr_in *addr4 = addr.bytes;
jens@0:         self.port = ntohs(addr4->sin_port);
jens@0:     }
jens@0:     
jens@0:     if( _useIPv6 ) {
jens@0:         // set up the IPv6 endpoint
jens@0:         struct sockaddr_in6 addr6;
jens@0:         memset(&addr6, 0, sizeof(addr6));
jens@0:         addr6.sin6_len = sizeof(addr6);
jens@0:         addr6.sin6_family = AF_INET6;
jens@0:         addr6.sin6_port = htons(_port);
jens@0:         memcpy(&(addr6.sin6_addr), &in6addr_any, sizeof(addr6.sin6_addr));
jens@0:         
jens@0:         _ipv6socket = [self _openProtocol: PF_INET6 address: (struct sockaddr*)&addr6 error: outError];
jens@0:         if( ! _ipv6socket ) {
jens@0:             _ipv4socket = closeSocket(_ipv4socket);
jens@0:             return [self _failedToOpen: *outError];
jens@0:         }
jens@0:     }
jens@0:     
jens@0:     // Open Bonjour:
jens@0:     if( _bonjourServiceType && !_netService) {
jens@0:         // instantiate the NSNetService object that will advertise on our behalf.
jens@0:         _netService = [[NSNetService alloc] initWithDomain: @"local." 
jens@0:                                                       type: _bonjourServiceType
jens@0:                                                       name: _bonjourServiceName ?:@""
jens@0:                                                       port: _port];
jens@0:         if( _netService ) {
jens@0:             [_netService setDelegate:self];
jens@0:             if( _bonjourTXTRecord )
jens@0:                 [self _updateTXTRecord];
jens@0:             [_netService publish];
jens@0:         } else {
jens@0:             self.bonjourError = -1;
jens@0:             Warn(@"%@: Failed to create NSNetService",self);
jens@0:         }
jens@0:     }
jens@0: 
jens@0:     LogTo(TCP,@"%@ is open",self);
jens@0:     [self tellDelegate: @selector(listenerDidOpen:) withObject: nil];
jens@0:     return YES;
jens@0: }
jens@0: 
jens@0: - (BOOL) open
jens@0: {
jens@0:     return [self open: nil];
jens@0: }
jens@0:     
jens@0: 
jens@0: - (void) close 
jens@0: {
jens@0:     if( _ipv4socket ) {
jens@0:         if( _netService ) {
jens@0:             [_netService stop];
jens@0:             [_netService release];
jens@0:             _netService = nil;
jens@0:             self.bonjourPublished = NO;
jens@0:         }
jens@0:         self.bonjourError = 0;
jens@0: 
jens@0:         _ipv4socket = closeSocket(_ipv4socket);
jens@0:         _ipv6socket = closeSocket(_ipv6socket);
jens@0: 
jens@0:         LogTo(BLIP,@"%@ is closed",self);
jens@0:         [self tellDelegate: @selector(listenerDidClose:) withObject: nil];
jens@0:     }
jens@0: }
jens@0: 
jens@0: 
jens@0: - (BOOL) isOpen
jens@0: {
jens@0:     return _ipv4socket != NULL;
jens@0: }
jens@0: 
jens@0: 
jens@0: #pragma mark -
jens@0: #pragma mark ACCEPTING CONNECTIONS:
jens@0: 
jens@0: 
jens@0: @synthesize connectionClass = _connectionClass;
jens@0: 
jens@0: 
jens@0: - (BOOL) acceptConnection: (CFSocketNativeHandle)socket
jens@0: {
jens@0:     IPAddress *addr = [IPAddress addressOfSocket: socket];
jens@0:     if( ! addr )
jens@0:         return NO;
jens@0:     if( [_delegate respondsToSelector: @selector(listener:shouldAcceptConnectionFrom:)]
jens@0:        && ! [_delegate listener: self shouldAcceptConnectionFrom: addr] )
jens@0:         return NO;
jens@0:     
jens@0:     Assert(_connectionClass);
jens@0:     TCPConnection *conn = [[self.connectionClass alloc] initIncomingFromSocket: socket
jens@0:                                                                       listener: self];
jens@0:     if( ! conn )
jens@0:         return NO;
jens@0:     
jens@0:     if( _sslProperties ) {
jens@0:         conn.SSLProperties = _sslProperties;
jens@0:         [conn setSSLProperty: $true forKey: (id)kCFStreamSSLIsServer];
jens@0:     }
jens@0:     [conn open];
jens@0:     [self tellDelegate: @selector(listener:didAcceptConnection:) withObject: conn];
jens@0:     return YES;
jens@0: }
jens@0: 
jens@0: 
jens@0: static void TCPListenerAcceptCallBack(CFSocketRef socket, CFSocketCallBackType type, CFDataRef address, const void *data, void *info) 
jens@0: {
jens@0:     TCPListener *server = (TCPListener *)info;
jens@0:     if (kCFSocketAcceptCallBack == type) { 
jens@0:         CFSocketNativeHandle nativeSocketHandle = *(CFSocketNativeHandle *)data;
jens@0:         BOOL accepted = NO;
jens@0:         @try{
jens@0:             accepted = [server acceptConnection: nativeSocketHandle];
jens@0:         }catchAndReport(@"TCPListenerAcceptCallBack");
jens@0:         if( ! accepted )
jens@0:             close(nativeSocketHandle);
jens@0:     }
jens@0: }
jens@0: 
jens@0: 
jens@0: #pragma mark -
jens@0: #pragma mark BONJOUR:
jens@0: 
jens@0: 
jens@0: - (NSDictionary*) bonjourTXTRecord
jens@0: {
jens@0:     return _bonjourTXTRecord;
jens@0: }
jens@0: 
jens@0: - (void) setBonjourTXTRecord: (NSDictionary*)txt
jens@0: {
jens@0:     if( ifSetObj(&_bonjourTXTRecord,txt) )
jens@0:         [self _updateTXTRecord];
jens@0: }
jens@0: 
jens@0: - (void) _updateTXTRecord
jens@0: {
jens@0:     if( _netService ) {
jens@0:         NSData *data;
jens@0:         if( _bonjourTXTRecord ) {
jens@0:             data = [NSNetService dataFromTXTRecordDictionary: _bonjourTXTRecord];
jens@0:             if( data )
jens@0:                 LogTo(BLIP,@"%@: Set %u-byte TXT record", self,data.length);
jens@0:             else
jens@0:                 Warn(@"TCPListener: Couldn't convert txt dict to data: %@",_bonjourTXTRecord);
jens@0:         } else
jens@0:             data = nil;
jens@0:         [_netService setTXTRecordData: data];
jens@0:     }
jens@0: }
jens@0: 
jens@0: 
jens@0: - (void)netServiceWillPublish:(NSNetService *)sender
jens@0: {
jens@0:     LogTo(BLIP,@"%@: Advertising %@",self,sender);
jens@0:     self.bonjourPublished = YES;
jens@0: }
jens@0: 
jens@0: - (void)netService:(NSNetService *)sender didNotPublish:(NSDictionary *)errorDict
jens@0: {
jens@0:     self.bonjourError = [[errorDict objectForKey:NSNetServicesErrorCode] intValue];
jens@0:     LogTo(BLIP,@"%@: Failed to advertise %@: error %i",self,sender,self.bonjourError);
jens@0:     [_netService release];
jens@0:     _netService = nil;
jens@0: }
jens@0: 
jens@0: - (void)netServiceDidStop:(NSNetService *)sender
jens@0: {
jens@0:     LogTo(BLIP,@"%@: Stopped advertising %@",self,sender);
jens@0:     self.bonjourPublished = NO;
jens@0:     [_netService release];
jens@0:     _netService = nil;
jens@0: }
jens@0: 
jens@0: 
jens@0: @end
jens@0: 
jens@0: 
jens@0: 
jens@0: /*
jens@0:  Copyright (c) 2008, Jens Alfke <jens@mooseyard.com>. All rights reserved.
jens@0:  
jens@0:  Redistribution and use in source and binary forms, with or without modification, are permitted
jens@0:  provided that the following conditions are met:
jens@0:  
jens@0:  * Redistributions of source code must retain the above copyright notice, this list of conditions
jens@0:  and the following disclaimer.
jens@0:  * Redistributions in binary form must reproduce the above copyright notice, this list of conditions
jens@0:  and the following disclaimer in the documentation and/or other materials provided with the
jens@0:  distribution.
jens@0:  
jens@0:  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
jens@0:  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 
jens@0:  FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRI-
jens@0:  BUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
jens@0:  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
jens@0:   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
jens@0:  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 
jens@0:  THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
jens@0:  */