Initial commit

9780596101008

+9780596101008
\ No newline at end of file

O'Reilly Zeroconf Book example code/C code/Makefile

+all: cf3 cf4 cf5 cf6
+
+cf3: test8.o test3.o
+	cc -framework CoreFoundation $+ -o $@
+
+cf4: test8.o test4.o
+	cc -framework CoreFoundation $+ -o $@
+
+cf5: test8.o test5.o
+	cc -framework CoreFoundation $+ -o $@
+
+cf6: test8.o test6.o
+	cc -framework CoreFoundation $+ -o $@

O'Reilly Zeroconf Book example code/C code/Windows MFC Example.cpp

+#include "stdafx.h"
#include <dns_sd.h>
#include <winsock2.h>

#define WM_PRIVATE_SERVICE_EVENT                ( WM_USER + 0x100 )

class MyWindow
:
    public CWnd
{
public:

    MyWindow();
    virtual ~MyWindow( void );

protected:

    // General

    afx_msg int     OnCreate( LPCREATESTRUCT inCreateStruct );
    afx_msg void    OnDestroy( void );
    afx_msg LONG    OnServiceEvent( WPARAM inWParam, LPARAM inLParam );

    // Browsing

    static void DNSSD_API
    BrowseReply(
            DNSServiceRef           inRef,
            DNSServiceFlags         inFlags,
            uint32_t                inInterfaceIndex,
            DNSServiceErrorType     inErrorCode,
            const char *            inName,
            const char *            inType,
            const char *            inDomain,
            void *                  inContext );

    DECLARE_MESSAGE_MAP()

private:

    DNSServiceRef m_serviceRef;
};

BEGIN_MESSAGE_MAP( MyWindow, CWnd )
    ON_WM_CREATE()
    ON_WM_DESTROY()
    ON_MESSAGE( WM_PRIVATE_SERVICE_EVENT, OnServiceEvent )
END_MESSAGE_MAP()

int
MyWindow::OnCreate( LPCREATESTRUCT inCreateStruct )
    {
    DNSServiceErrorType err;

    err = CWnd::OnCreate( inCreateStruct );

    if ( err )
        goto exit;

    err = DNSServiceBrowse( &m_serviceRef, 0, 0, "_http._tcp", NULL, BrowseReply, this );

    if ( err )
        goto exit;

    err = WSAAsyncSelect( (SOCKET) DNSServiceRefSockFD(m_serviceRef), m_hWnd,
                         WM_PRIVATE_SERVICE_EVENT, FD_READ|FD_CLOSE);

exit:

    if ( err )
        {
        if ( m_serviceRef )
            {
            DNSServiceRefDeallocate( m_serviceRef );
            m_serviceRef = NULL;
            }
        }

    return( err );
    }

void
MyWindow::OnDestroy( void )
    {
    // ...

    if ( m_serviceRef )
        {
        WSAAsyncSelect( ( SOCKET ) DNSServiceRefSockFD( m_serviceRef ), m_hWnd, 0, 0 );
        DNSServiceRefDeallocate( m_serviceRef );
        }

    // ...
    }

LONG
MyWindow::OnServiceEvent(WPARAM inWParam, LPARAM inLParam)
    {
    SOCKET              sock = (SOCKET) inWParam;
    DNSServiceErrorType err;

    if ( WSAGETSELECTERROR(inLParam) && !(HIWORD(inLParam)))
        goto exit;

    ASSERT( ( SOCKET ) DNSServiceRefSockFD( m_serviceRef ) == sock );
    err = DNSServiceProcessResult( m_serviceRef );
    ASSERT( !err );

exit:

    return ( 0 );
    }

void DNSSD_API
MyWindow::BrowseReply(
        DNSServiceRef           inRef,
        DNSServiceFlags         inFlags,
        uint32_t                inInterfaceIndex,
        DNSServiceErrorType     inErrorCode,
        const char *            inName,
        const char *            inType,
        const char *            inDomain,
        void *                  inContext )
    {
    MyWindow * self = reinterpret_cast<MyWindow*>( inContext );
    ASSERT( self );

    // ...
    }
\ No newline at end of file

O'Reilly Zeroconf Book example code/C code/test1.c

+// Skeleton of how to handle DNSServiceDiscovery events using a select() loop
+
+#include "dns_sd.h"
+#include <stdio.h>			// For stdout, stderr
+#include <string.h>			// For strlen(), strcpy(), bzero()
+#include <errno.h>          // For errno, EINTR
+#include <time.h>
+#include <sys/time.h>		// For struct timeval
+#include <unistd.h>         // For getopt() and optind
+#include <arpa/inet.h>		// For inet_addr()
+
+int stopNow = 0;
+DNSServiceErrorType err;
+
+void HandleEvents(DNSServiceRef serviceRef)
+	{
+	int dns_sd_fd = DNSServiceRefSockFD(serviceRef);
+	int nfds = dns_sd_fd + 1;
+	fd_set readfds;
+	struct timeval tv;
+	// . . .
+	while (!stopNow)
+		{
+		// . . .
+		int result = select(nfds, &readfds, (fd_set*)NULL, (fd_set*)NULL, &tv);
+		if (result > 0)
+			{
+			// . . .
+			if (FD_ISSET(dns_sd_fd, &readfds))
+				err = DNSServiceProcessResult(serviceRef);
+			if (err) stopNow = 1;
+			}		
+		}
+	}
+
+main()
+	{
+	DNSServiceRef ref;
+	HandleEvents(ref);
+	}

O'Reilly Zeroconf Book example code/C code/test2.c

+// Simple example (single event source only)
+// of how to handle DNSServiceDiscovery events using a select() loop
+
+#include <dns_sd.h>
+#include <stdio.h>			// For stdout, stderr
+#include <string.h>			// For strlen(), strcpy(), bzero()
+#include <errno.h>          // For errno, EINTR
+#include <time.h>
+
+#ifdef _WIN32
+#include <process.h>
+typedef	int	pid_t;
+#define	getpid	_getpid
+#define	strcasecmp	_stricmp
+#define snprintf _snprintf
+#else
+#include <sys/time.h>		// For struct timeval
+#include <unistd.h>         // For getopt() and optind
+#include <arpa/inet.h>		// For inet_addr()
+#endif
+
+// Note: the select() implementation on Windows (Winsock2)
+//fails with any timeout much larger than this
+#define LONG_TIME 100000000
+
+static volatile int stopNow = 0;
+static volatile int timeOut = LONG_TIME;
+
+void HandleEvents(DNSServiceRef serviceRef)
+	{
+	int dns_sd_fd = DNSServiceRefSockFD(serviceRef);
+	int nfds = dns_sd_fd + 1;
+	fd_set readfds;
+	struct timeval tv;
+	int result;
+	
+	while (!stopNow)
+		{
+		FD_ZERO(&readfds);
+		FD_SET(dns_sd_fd, &readfds);
+		tv.tv_sec = timeOut;
+		tv.tv_usec = 0;
+
+		result = select(nfds, &readfds, (fd_set*)NULL, (fd_set*)NULL, &tv);
+		if (result > 0)
+			{
+			DNSServiceErrorType err = kDNSServiceErr_NoError;
+			if (FD_ISSET(dns_sd_fd, &readfds))
+                  err = DNSServiceProcessResult(serviceRef);
+			if (err) { fprintf(stderr,
+                           "DNSServiceProcessResult returned %d\n", err);
+                        stopNow = 1; }
+			}		
+		else
+			{
+			printf("select() returned %d errno %d %s\n",
+                      result, errno, strerror(errno));
+			if (errno != EINTR) stopNow = 1;
+			}
+		}
+	}

O'Reilly Zeroconf Book example code/C code/test3.c

+#include <dns_sd.h>
+#include <stdio.h>	 // For stdout, stderr
+#include <string.h>	 // For strlen(), strcpy(), bzero()
+
+extern void HandleEvents(DNSServiceRef);
+
+static void
+MyBrowseCallBack(DNSServiceRef service,
+				DNSServiceFlags flags,
+				uint32_t interfaceIndex,
+				DNSServiceErrorType errorCode,
+				const char * name,
+				const char * type,
+				const char * domain,
+				void * context)
+	{
+	#pragma unused(context)
+	if (errorCode != kDNSServiceErr_NoError)
+		fprintf(stderr, "MyBrowseCallBack returned %d\n", errorCode);
+	else
+		{
+		char *addString  = (flags & kDNSServiceFlagsAdd) ? "ADD" : "REMOVE";
+		char *moreString = (flags & kDNSServiceFlagsMoreComing) ? "MORE" : "    ";
+		printf("%-7s%-5s %d%s.%s%s\n",
+			addString, moreString, interfaceIndex, name, type, domain);
+		}
+	if (!(flags & kDNSServiceFlagsMoreComing)) fflush(stdout);
+	}
+
+static DNSServiceErrorType
+MyDNSServiceBrowse()
+	{
+	DNSServiceErrorType error;
+	DNSServiceRef  serviceRef;
+	
+	error = DNSServiceBrowse(&serviceRef,
+							0,                // no flags
+							0,                // all network interfaces
+							"_http._tcp",     // service type
+							"",               // default domains
+							MyBrowseCallBack, // call back function
+							NULL);            // no context
+	if (error == kDNSServiceErr_NoError)
+		{
+		HandleEvents(serviceRef); // Add service to runloop to get callbacks
+		DNSServiceRefDeallocate(serviceRef);
+		}
+
+	return error;
+	}
+
+int main (int argc, const char * argv[])
+	{
+	DNSServiceErrorType error = MyDNSServiceBrowse();
+	if (error) fprintf(stderr, "DNSServiceDiscovery returned %d\n", error);
+	return 0;
+	}

O'Reilly Zeroconf Book example code/C code/test4.c

+// DNSServiceResolve example
+
+#include <dns_sd.h>
+#include <stdio.h>			// For stdout, stderr
+#include <string.h>			// For strlen(), strcpy(), bzero()
+
+extern void HandleEvents(DNSServiceRef);
+
+static void
+MyResolveCallBack(DNSServiceRef serviceRef,
+				  DNSServiceFlags flags,
+				  uint32_t interface,
+				  DNSServiceErrorType errorCode,
+				  const char *fullname,
+				  const char *hosttarget,
+				  uint16_t port,
+				  uint16_t txtLen,
+				  const char *txtRecord,
+				  void *context)
+	{
+	#pragma unused(flags)
+	#pragma unused(fullname)
+
+	if (errorCode != kDNSServiceErr_NoError)
+		fprintf(stderr, "MyResolveCallBack returned %d\n", errorCode);
+	else
+		printf("RESOLVE: %s is at %s:%d\n", fullname, hosttarget, ntohs(port));
+	if (!(flags & kDNSServiceFlagsMoreComing)) fflush(stdout);
+	}
+
+
+static DNSServiceErrorType MyDNSServiceResolve()
+	{
+	DNSServiceErrorType error;
+	DNSServiceRef  serviceRef;
+	
+	error = DNSServiceResolve(&serviceRef,
+							   0,  // no flags
+							   0,  // all network interfaces
+							   "Not a real page", //name
+							   "_http._tcp", // service type
+							   "local", //domain
+							   MyResolveCallBack,
+							   NULL);	 // no context					
+	
+	if (error == kDNSServiceErr_NoError)
+		{
+		HandleEvents(serviceRef);  // Add service to runloop to get callbacks
+		DNSServiceRefDeallocate(serviceRef);
+		}
+	return error;
+	}
+
+int main (int argc, const char * argv[])
+	{
+	DNSServiceErrorType error = MyDNSServiceResolve();
+	fprintf(stderr, "DNSServiceDiscovery returned %d\n", error);
+									//if function returns print error
+	return 0;
+	}

O'Reilly Zeroconf Book example code/C code/test5.c

+// DNSServiceRegister example
+
+#include <dns_sd.h>
+#include <stdio.h>			// For stdout, stderr
+#include <string.h>			// For strlen(), strcpy(), bzero()
+
+extern void HandleEvents(DNSServiceRef);
+
+static void
+MyRegisterCallBack(DNSServiceRef service,
+				   DNSServiceFlags flags,
+				   DNSServiceErrorType errorCode,
+				   const char * name,
+				   const char * type,
+				   const char * domain,
+				   void * context)
+	{
+	#pragma unused(flags)
+	#pragma unused(context)
+
+	if (errorCode != kDNSServiceErr_NoError)
+		fprintf(stderr, "MyRegisterCallBack returned %d\n", errorCode);
+	else
+		printf("%-15s %s.%s%s\n","REGISTER", name, type, domain);
+	}
+
+static DNSServiceErrorType MyDNSServiceRegister()
+	{
+	DNSServiceErrorType error;
+	DNSServiceRef serviceRef;
+	
+	error = DNSServiceRegister(&serviceRef,
+								0,                  // no flags
+								0,                  // all network interfaces
+								"Not a real page",  // name
+								"_http._tcp",       // service type
+								"",                 // register in default domain(s)
+								NULL,               // use default host name
+								htons(9092),        // port number
+								0,                  // length of TXT record
+								NULL,               // no TXT record
+								MyRegisterCallBack, // call back function
+								NULL);              // no context
+	
+	if (error == kDNSServiceErr_NoError)
+		{
+		HandleEvents(serviceRef);
+		DNSServiceRefDeallocate(serviceRef);
+		}
+	
+	return error;
+	}
+
+int main (int argc, const char * argv[])
+	{
+	DNSServiceErrorType error = MyDNSServiceRegister();
+	fprintf(stderr, "DNSServiceDiscovery returned %d\n", error);
+	return 0;
+	}

O'Reilly Zeroconf Book example code/C code/test6.c

+// DNSServiceEnumerateDomains example
+
+#include <dns_sd.h>
+#include <stdio.h>			// For stdout, stderr
+#include <string.h>			// For strlen(), strcpy(), bzero()
+
+extern void HandleEvents(DNSServiceRef);
+
+static void
+MyEnumerateBrowseDomainsCallBack(DNSServiceRef sdRef,
+								 DNSServiceFlags flags,
+								 uint32_t interface,
+								 DNSServiceErrorType errorCode,
+								 const char *replyDomain,
+								 void *context)
+	{
+	#pragma unused(context)
+
+	if (errorCode != kDNSServiceErr_NoError)
+		fprintf(stderr, "MyEnumerateBrowseDomainsCallBack returned %d\n", errorCode);
+	else
+		{
+		char *moreString = (flags & kDNSServiceFlagsMoreComing) ? "MORE" : "";
+		char *addString  = "REMOVE";
+		if (flags & kDNSServiceFlagsAdd)
+			addString = (flags & kDNSServiceFlagsDefault) ? "DEFAULT" : "ADD";
+		printf("%-8s%-5s%s\n", addString, moreString, replyDomain);
+		}
+
+	if (!(flags & kDNSServiceFlagsMoreComing)) fflush(stdout);
+	}
+
+static DNSServiceErrorType MyDNSServiceEnumerateBrowse()
+	{
+	DNSServiceErrorType error;
+	DNSServiceRef  serviceRef;
+	
+	error = DNSServiceEnumerateDomains(
+					  &serviceRef,
+					  kDNSServiceFlagsBrowseDomains,  // browse domains
+					  0,  // all network interfaces
+					  MyEnumerateBrowseDomainsCallBack, //callback function
+					  NULL);	// no context
+	
+	if (error == kDNSServiceErr_NoError)
+		{
+		HandleEvents(serviceRef);  // Add service to runloop to get callbacks
+		DNSServiceRefDeallocate(serviceRef);
+		}
+	return error;
+	}
+
+int main (int argc, const char * argv[])
+	{
+	DNSServiceErrorType error = MyDNSServiceEnumerateBrowse();
+	if (error) fprintf(stderr, "DNSServiceDiscovery returned %d\n", error);
+	return 0;
+	}

O'Reilly Zeroconf Book example code/C code/test7.c

+// Skeleton of how to handle DNSServiceDiscovery events using a CFRunLoop
+
+typedef struct MyDNSServiceState
+	{
+	DNSServiceRef		service;
+	CFSocketRef			socket;
+	CFRunLoopSourceRef	source;
+	} MyDNSServiceState;
+
+void HandleEvents(DNSServiceRef serviceRef)
+	{
+	// . . .
+	// Access the underlying Unix domain socket and create a CFSocket
+	sock = DNSServiceRefSockFD(ref->service);
+	ref->socket = CFSocketCreateWithNative(NULL, sock,
+										   kCFSocketReadCallBack,
+										   MySocketCallBack, &context);
+	// . . .
+	// Create a CFRunLoopSource from the CFSocket, add to run loop and start.
+	ref->source = CFSocketCreateRunLoopSource(NULL, ref->socket, 0);
+	CFRunLoopAddSource(CFRunLoopGetCurrent(), ref->source, kCFRunLoopCommonModes);
+	CFRunLoopRun();
+	}

O'Reilly Zeroconf Book example code/C code/test8.c

+// Simple example of how to handle DNSServiceDiscovery events using a CFRunLoop
+
+#include <dns_sd.h>
+#include <CoreFoundation/CoreFoundation.h>
+
+
+// Structure to hold CFRunLoop-related state
+
+typedef struct MyDNSServiceState
+    {
+    DNSServiceRef       service;    // Active DNSServiceDiscovery operation
+    CFSocketRef         cfsocket;   // CFSocket for this operation
+    CFRunLoopSourceRef  source;     // RunLoopSource for this CFSocket
+    } MyDNSServiceState;
+
+
+// Remove a DNSServiceDiscovery operation from a CFRunLoop's
+// set of active event sources
+
+static void DNSServiceRemoveSource(CFRunLoopRef rl, MyDNSServiceState *ref)
+    {
+    assert(rl != NULL);
+    assert(ref != NULL);
+
+    // Remove the CFRunLoopSource from the current run loop.
+    CFRunLoopRemoveSource(rl, ref->source, kCFRunLoopCommonModes);
+    CFRelease(ref->source);
+
+    // Invalidate the CFSocket.
+    CFSocketInvalidate(ref->cfsocket);
+    CFRelease(ref->cfsocket);
+
+    // Workaround to give time to CFSocket's select() thread
+    // so it can remove the socket from its FD set before we
+    // close the socket by calling DNSServiceRefDeallocate.
+    usleep(1000);
+
+    // Terminate the connection with the daemon, which cancels the operation.
+    DNSServiceRefDeallocate(ref->service);
+    free(ref);
+    }
+
+
+// Helper function: When CFRunLoop indicates an interesting event,
+// this function calls DNSServiceProcessResult() to handle it
+
+static void MySocketCallBack(CFSocketRef s, CFSocketCallBackType type,
+                 CFDataRef address, const void *data, void *info)
+    {
+    #pragma unused(s)
+    #pragma unused(type)
+    #pragma unused(address)
+    #pragma unused(data)
+
+    DNSServiceErrorType err;
+    MyDNSServiceState *ref = (MyDNSServiceState *)info;
+    assert(ref != NULL);
+
+    // Read a reply from the daemon, which will call the appropriate callback.
+    err= DNSServiceProcessResult(ref->service);
+    if (err != kDNSServiceErr_NoError)
+        {
+        fprintf(stderr, "DNSServiceProcessResult returned %d\n", err);
+        // Terminate the discovery operation and release everything.
+        DNSServiceRemoveSource(CFRunLoopGetCurrent(), ref);
+        }
+    }
+
+
+// Add a DNSServiceDiscovery operation to a CFRunLoop's
+// set of active event sources
+
+static void DNSServiceAddSource(CFRunLoopRef rl, MyDNSServiceState *ref)
+    {
+    CFSocketContext context = { 0, ref, NULL, NULL, NULL };
+    CFSocketNativeHandle sock = DNSServiceRefSockFD(ref->service);
+    assert(sock != -1);
+
+    // Create a CFSocket from the underlying Unix Domain socket.
+    ref->cfsocket = CFSocketCreateWithNative(NULL, sock,
+                    kCFSocketReadCallBack, MySocketCallBack, &context);
+
+    // Prevent CFSocketInvalidate from closing DNSServiceRef's socket.
+    CFOptionFlags f = CFSocketGetSocketFlags(ref->cfsocket);
+    CFSocketSetSocketFlags(ref->cfsocket, f & ~kCFSocketCloseOnInvalidate);
+
+    // Create a CFRunLoopSource from the CFSocket.
+    ref->source = CFSocketCreateRunLoopSource(NULL, ref->cfsocket, 0);
+
+    // Add the CFRunLoopSource to the current run loop.
+    CFRunLoopAddSource(rl, ref->source, kCFRunLoopCommonModes);
+    }
+
+
+// Simple example: Here we just add a single DNSServiceDiscovery event source,
+// and then call CFRunLoopRun() to handle the events. In a program that already
+// has a main RunLoop, you'd just keep that as is, and use DNSServiceAddSource/
+// DNSServiceRemoveSource to add and remove event sources from that RunLoop.
+
+void HandleEvents(DNSServiceRef serviceRef)
+    {
+    MyDNSServiceState ref = { serviceRef };
+    DNSServiceAddSource(CFRunLoopGetCurrent(), &ref);
+
+    CFRunLoopRun();
+    }