/*

     File: TCPServer.m

 Abstract: TCPServer class.

  Version: 1.0

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*/

/*

 File: TCPServer.m

 Abstract: Interface description for a basic TCP/IP server Foundation class

*/ 

#import "TCPServer.h"

#include <sys/socket.h>

#include <netinet/in.h>

#include <unistd.h>

NSString * const TCPServerErrorDomain = @"TCPServerErrorDomain";

@implementation TCPServer

- (id)init {

    return self;

}

- (void)dealloc {

    [self stop];

    [domain release];

    [name release];

    [type release];

    [super dealloc];

}

- (id)delegate {

    return delegate;

}

- (void)setDelegate:(id)value {

    delegate = value;

}

- (NSString *)domain {

    return domain;

}

- (void)setDomain:(NSString *)value {

    if (domain != value) {

        [domain release];

        domain = [value copy];

    }

}

- (NSString *)name {

    return name;

}

- (void)setName:(NSString *)value {

    if (name != value) {

        [name release];

        name = [value copy];

    }

}

- (NSString *)type {

    return type;

}

- (void)setType:(NSString *)value {

    if (type != value) {

        [type release];

        type = [value copy];

    }

}

- (uint16_t)port {

    return port;

}

- (void)setPort:(uint16_t)value {

    port = value;

}

- (void)handleNewConnectionFromAddress:(NSData *)addr inputStream:(NSInputStream *)istr outputStream:(NSOutputStream *)ostr {

    // if the delegate implements the delegate method, call it  

    if (delegate && [delegate respondsToSelector:@selector(TCPServer:didReceiveConnectionFrom:inputStream:outputStream:)]) { 

        [delegate TCPServer:self didReceiveConnectionFromAddress:addr inputStream:istr outputStream:ostr];

    }

}

// This function is called by CFSocket when a new connection comes in.

// We gather some data here, and convert the function call to a method

// invocation on TCPServer.

static void TCPServerAcceptCallBack(CFSocketRef socket, CFSocketCallBackType type, CFDataRef address, const void *data, void *info) {

    TCPServer *server = (TCPServer *)info;

    if (kCFSocketAcceptCallBack == type) { 

        // for an AcceptCallBack, the data parameter is a pointer to a CFSocketNativeHandle

        CFSocketNativeHandle nativeSocketHandle = *(CFSocketNativeHandle *)data;

        uint8_t name[SOCK_MAXADDRLEN];

        socklen_t namelen = sizeof(name);

        NSData *peer = nil;

        if (0 == getpeername(nativeSocketHandle, (struct sockaddr *)name, &namelen)) {

            peer = [NSData dataWithBytes:name length:namelen];

        }

        CFReadStreamRef readStream = NULL;

    CFWriteStreamRef writeStream = NULL;

        CFStreamCreatePairWithSocket(kCFAllocatorDefault, nativeSocketHandle, &readStream, &writeStream);

        if (readStream && writeStream) {

            CFReadStreamSetProperty(readStream, kCFStreamPropertyShouldCloseNativeSocket, kCFBooleanTrue);

            CFWriteStreamSetProperty(writeStream, kCFStreamPropertyShouldCloseNativeSocket, kCFBooleanTrue);

            [server handleNewConnectionFromAddress:peer inputStream:(NSInputStream *)readStream outputStream:(NSOutputStream *)writeStream];

        } else {

            // on any failure, need to destroy the CFSocketNativeHandle 

            // since we are not going to use it any more

            close(nativeSocketHandle);

        }

        if (readStream) CFRelease(readStream);

        if (writeStream) CFRelease(writeStream);

    }

}

- (BOOL)start:(NSError **)error {

    CFSocketContext socketCtxt = {0, self, NULL, NULL, NULL};

    ipv4socket = CFSocketCreate(kCFAllocatorDefault, PF_INET, SOCK_STREAM, IPPROTO_TCP, kCFSocketAcceptCallBack, (CFSocketCallBack)&TCPServerAcceptCallBack, &socketCtxt);

    ipv6socket = CFSocketCreate(kCFAllocatorDefault, PF_INET6, SOCK_STREAM, IPPROTO_TCP, kCFSocketAcceptCallBack, (CFSocketCallBack)&TCPServerAcceptCallBack, &socketCtxt);

    if (NULL == ipv4socket || NULL == ipv6socket) {

        if (error) *error = [[NSError alloc] initWithDomain:TCPServerErrorDomain code:kTCPServerNoSocketsAvailable userInfo:nil];

        if (ipv4socket) CFRelease(ipv4socket);

        if (ipv6socket) CFRelease(ipv6socket);

        ipv4socket = NULL;

        ipv6socket = NULL;

        return NO;

    }

    int yes = 1;

    setsockopt(CFSocketGetNative(ipv4socket), SOL_SOCKET, SO_REUSEADDR, (void *)&yes, sizeof(yes));

    setsockopt(CFSocketGetNative(ipv6socket), SOL_SOCKET, SO_REUSEADDR, (void *)&yes, sizeof(yes));

    // set up the IPv4 endpoint; if port is 0, this will cause the kernel to choose a port for us

    struct sockaddr_in addr4;

    memset(&addr4, 0, sizeof(addr4));

    addr4.sin_len = sizeof(addr4);

    addr4.sin_family = AF_INET;

    addr4.sin_port = htons(port);

    addr4.sin_addr.s_addr = htonl(INADDR_ANY);

    NSData *address4 = [NSData dataWithBytes:&addr4 length:sizeof(addr4)];

    if (kCFSocketSuccess != CFSocketSetAddress(ipv4socket, (CFDataRef)address4)) {

        if (error) *error = [[NSError alloc] initWithDomain:TCPServerErrorDomain code:kTCPServerCouldNotBindToIPv4Address userInfo:nil];

        if (ipv4socket) CFRelease(ipv4socket);

        if (ipv6socket) CFRelease(ipv6socket);

        ipv4socket = NULL;

        ipv6socket = NULL;

        return NO;

    }

    if (0 == port) {

        // now that the binding was successful, we get the port number 

        // -- we will need it for the v6 endpoint and for the NSNetService

        NSData *addr = [(NSData *)CFSocketCopyAddress(ipv4socket) autorelease];

        memcpy(&addr4, [addr bytes], [addr length]);

        port = ntohs(addr4.sin_port);

    }

    // set up the IPv6 endpoint

    struct sockaddr_in6 addr6;

    memset(&addr6, 0, sizeof(addr6));

    addr6.sin6_len = sizeof(addr6);

    addr6.sin6_family = AF_INET6;

    addr6.sin6_port = htons(port);

    memcpy(&(addr6.sin6_addr), &in6addr_any, sizeof(addr6.sin6_addr));

    NSData *address6 = [NSData dataWithBytes:&addr6 length:sizeof(addr6)];

    if (kCFSocketSuccess != CFSocketSetAddress(ipv6socket, (CFDataRef)address6)) {

        if (error) *error = [[NSError alloc] initWithDomain:TCPServerErrorDomain code:kTCPServerCouldNotBindToIPv6Address userInfo:nil];

        if (ipv4socket) CFRelease(ipv4socket);

        if (ipv6socket) CFRelease(ipv6socket);

        ipv4socket = NULL;

        ipv6socket = NULL;

        return NO;

    }

    // set up the run loop sources for the sockets

    CFRunLoopRef cfrl = CFRunLoopGetCurrent();

    CFRunLoopSourceRef source4 = CFSocketCreateRunLoopSource(kCFAllocatorDefault, ipv4socket, 0);

    CFRunLoopAddSource(cfrl, source4, kCFRunLoopCommonModes);

    CFRelease(source4);

    CFRunLoopSourceRef source6 = CFSocketCreateRunLoopSource(kCFAllocatorDefault, ipv6socket, 0);

    CFRunLoopAddSource(cfrl, source6, kCFRunLoopCommonModes);

    CFRelease(source6);

    // we can only publish the service if we have a type to publish with

    if (nil != type) {

        NSString *publishingDomain = domain ? domain : @"";

        NSString *publishingName = nil;

        if (nil != name) {

            publishingName = name;

        } else {

            NSString * thisHostName = [[NSProcessInfo processInfo] hostName];

            if ([thisHostName hasSuffix:@".local"]) {

                publishingName = [thisHostName substringToIndex:([thisHostName length] - 6)];

            }

        }

        netService = [[NSNetService alloc] initWithDomain:publishingDomain type:type name:publishingName port:port];

        [netService publish];

    }

    return YES;

}

- (BOOL)stop {

    [netService stop];

    [netService release];

    netService = nil;

    CFSocketInvalidate(ipv4socket);

    CFSocketInvalidate(ipv6socket);

    CFRelease(ipv4socket);

    CFRelease(ipv6socket);

    ipv4socket = NULL;

    ipv6socket = NULL;

    return YES;

}

@end