ITInetServerSocket.m

   1 //
   2 //  ITInetServerSocket.m
   3 //  ITFoundation
   4 //
   5 //  Created by Alexander Strange on Thu Feb 13 2003.
   6 //  Copyright (c) 2003 __MyCompanyName__. All rights reserved.
   7 //
   8
   9 #import "ITInetServerSocket.h"
  10 #import "ITInetSocket.h"
  11 #import <sys/types.h>
  12 #import <sys/time.h>
  13 #import <arpa/inet.h>
  14 #import <netinet/in.h>
  15 #import <sys/socket.h>
  16 #import <netdb.h>
  17 #import <fcntl.h>
  18 #import <unistd.h>
  19
  20 /* Too bad Objective-C doesn't have class variables... */
  21 static NSMutableSet *servsockets;
  22 static NSTimer *timer;
  23 @interface ITInetServerSocket(Private)
  24 +(void)registerSocket:(ITInetServerSocket*)sock;
  25 +(void)unregisterSocket:(ITInetServerSocket*)sock;
  26 -(short)lookupPortForServiceType:(NSString*)name;
  27 -(void)setupConnection;
  28 -(void)stopConnection;
  29 -(void)setupRendezvousAdvertising;
  30 -(void)stopRendezvousAdvertising;
  31 +(void)setupTimer;
  32 +(void)stopTimer;
  33 +(void)globalTimerFunc:(NSTimer*)timer;
  34 -(void)timerFunc;
  35 @end
  36
  37 @implementation ITInetServerSocket
  38 + (void)initialize
  39 {
  40     servsockets = [[NSMutableSet alloc] init];
  41     [self setupTimer];
  42 }
  43
  44 - (id)init
  45 {
  46     if (self = [super init])
  47            {
  48            sockfd = -1;
  49            delegate = nil;
  50            clients = [[NSMutableSet alloc] init];
  51            service = nil;
  52            port = 0;
  53            rndType = rndName = nil;
  54            }
  55     return self;
  56 }
  57
  58 - (id)initWithDelegate:(id)d
  59 {
  60     if (self = [super init])
  61            {
  62            sockfd = -1;
  63            delegate = [d retain];
  64            clients = [[NSMutableSet alloc] init];
  65            service = nil;
  66            port = 0;
  67            rndType = rndName = nil;
  68            }
  69     return self;
  70 }
  71
  72 - (void)dealloc
  73 {
  74     [self stopConnection];
  75     [clients release];
  76     [delegate release];
  77     [rndName release];
  78     [rndType release];
  79 }
  80
  81 - (BOOL)start
  82 {
  83     if (!rndName || !rndType || !port) return NO;
  84     [ITInetServerSocket registerSocket:self];
  85     return YES;
  86 }
  87
  88 - (int)sockfd
  89 {
  90     return sockfd;
  91 }
  92
  93 - (NSSet*)clients
  94 {
  95     return clients;
  96 }
  97
  98 - (id)delegate
  99 {
 100     return delegate;
 101 }
 102
 103 - (short)port
 104 {
 105     return port;
 106 }
 107
 108 - (void)stop
 109 {
 110     [ITInetServerSocket unregisterSocket:self];
 111 }
 112
 113 - (void)setServiceType:(NSString*)type useForPort:(BOOL)p
 114 {
 115     rndType = [type retain];
 116     if (p) {
 117            port = [self lookupPortForServiceType:type];
 118     }
 119 }
 120
 121 - (void)setServiceName:(NSString*)name
 122 {
 123     rndName = [name retain];
 124 }
 125
 126 - (void)setPort:(short)p
 127 {
 128     port = p;
 129 }
 130 @end
 131
 132 @implementation ITInetServerSocket(Private)
 133 +(void)registerSocket:(ITInetServerSocket*)sock
 134 {
 135     [sock setupConnection];
 136     [servsockets addObject:sock];
 137 }
 138
 139 +(void)unregisterSocket:(ITInetServerSocket*)sock
 140 {
 141     [sock stopConnection];
 142     [servsockets removeObject:sock];
 143 }
 144
 145 -(short)lookupPortForServiceType:(NSString*)name
 146 {
 147     const char *_name = [name cString];
 148     struct addrinfo hints,*res;
 149     short p;
 150
 151     hints.ai_flags = AI_PASSIVE;
 152     hints.ai_family = PF_INET;
 153     hints.ai_socktype = SOCK_STREAM;
 154     hints.ai_protocol = IPPROTO_TCP;
 155     hints.ai_addrlen = 0;
 156     hints.ai_canonname = NULL;
 157     hints.ai_addr = NULL;
 158     hints.ai_next = NULL;
 159
 160     getaddrinfo(NULL,_name,&hints,&res);
 161     p = ntohs(((struct sockaddr_in *)res->ai_addr)->sin_port);
 162     freeaddrinfo(res);
 163     return p;
 164 }
 165
 166 -(void)setupConnection
 167 {
 168     struct sockaddr_in sa;
 169
 170     sockfd = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
 171     sa.sin_addr.s_addr = INADDR_ANY;
 172     sa.sin_family = AF_INET;
 173     sa.sin_port = htons(port);
 174     bind(sockfd,(struct sockaddr *)&sa,sizeof(sa));
 175     listen(sockfd, SOMAXCONN);
 176     fcntl(sockfd,F_SETFL,O_NONBLOCK);
 177     [self setupRendezvousAdvertising];
 178 }
 179
 180 - (void)stopConnection
 181 {
 182     [self stopRendezvousAdvertising];
 183     [clients makeObjectsPerformSelector:@selector(disconnect)];
 184     shutdown(sockfd,2);
 185     close(sockfd);
 186     sockfd = -1;
 187 }
 188
 189 - (void)setupRendezvousAdvertising
 190 {
 191     service = [[NSNetService alloc] initWithDomain:@"" type:[NSString stringWithFormat:@"_%@._tcp.",rndType] name:rndName port:htons(port)];
 192     [service publish];
 193 }
 194
 195 - (void)stopRendezvousAdvertising
 196 {
 197     [service stop];
 198     [service release];
 199     service = nil;
 200 }
 201
 202 + (void)setupTimer
 203 {
 204     if (!timer) timer = [NSTimer timerWithTimeInterval:0 target:self selector:@selector(globalTimerFunc:) userInfo:nil repeats:YES];
 205     [[NSRunLoop currentRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];
 206 }
 207
 208 + (void)stopTimer
 209 {
 210     [timer invalidate];
 211     [timer release];
 212     timer = nil;
 213 }
 214
 215 + (void)globalTimerFunc:(NSTimer*)timer
 216 {
 217     [servsockets makeObjectsPerformSelector:@selector(timerFunc)];
 218 }
 219
 220 - (void)timerFunc
 221 {
 222     if (sockfd != -1)
 223            {
 224            struct sockaddr_in csa;
 225            int csalen;
 226            signed int cfd;
 227            cfd = accept(sockfd,(struct sockaddr*)&csa,&csalen);
 228            if (cfd == -1) {
 229                   if (errno == EWOULDBLOCK) ;
 230                   else {perror("Too bad I haven't implemented error checking yet");}
 231            }
 232            else {
 233                   ITInetSocket *csocket = [[[ITInetSocket alloc] initWithFD:cfd delegate:self] autorelease];
 234                   [clients addObject:csocket];
 235                   [delegate newClientJoined:csocket];
 236            }
 237            }
 238 }
 239 @end