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owntone-server/osx/Firefly Helper/FireflyServer.m

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//
// FireflyServer.m
//
// The "model" part of our Model-View-Controller trio. Represents the
// firefly server itself, and encapsulates launching, quitting, status,
// etc.
//
// Created by Mike Kobb on 7/12/06.
// Copyright 2006 Roku, LLC. All rights reserved.
//
#import <CoreFoundation/CoreFoundation.h>
#import <netinet/in.h> // for sockaddr_in
#include <arpa/inet.h> // for inet_ntoa and so forth
#include <sys/socket.h> // AF_INET6
#import "FireflyServer.h"
@implementation FireflyServer
// ---------------------------------------------------------------------------
// initWithServerPath
//
// Initialize the server object to manage the server at the given path.
// ---------------------------------------------------------------------------
- (id)initWithServerPath:(NSString *) path
{
if( ( self = [super init] ) != nil )
{
fireflyServerPath = [[NSString stringWithString:path] retain];
serverTask = nil;
delegate = nil;
serverVersion = nil;
serverURL = nil;
status = kFireflyStatusStopped;
// Bonjour stuff below
netBrowser = [[NSNetServiceBrowser alloc] init];
pendingNetServices = [[NSMutableArray arrayWithCapacity:5] retain];
fireflyService = nil;
// Pick a random ffid that we'll be able to use to identify our
// server easily
srand((unsigned int)time(NULL));
sprintf( ffid, "%08x", rand() );
// Register for task ending notifications, so we can find out
// if our server process quits.
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(taskEnded:)
name:NSTaskDidTerminateNotification
object:nil];
}
return self;
}
// ---------------------------------------------------------------------------
// dealloc
//
//
// ---------------------------------------------------------------------------
- (void)dealloc
{
// First, kill the server!
[fireflyServerPath release];
[serverTask release];
[serverVersion release];
[serverURL release];
[netBrowser release];
[pendingNetServices release];
[fireflyService release];
[[NSNotificationCenter defaultCenter] removeObserver:self];
[super dealloc];
}
// ---------------------------------------------------------------------------
// setup
//
// Not to be confused with 'start', this function is to be called before
// starting to use the object. It handles starting our Bonjour stuff and
// so on.
// ---------------------------------------------------------------------------
- (void)setup
{
// It's time to start our scan, limiting to the local host.
[netBrowser setDelegate:self];
[netBrowser searchForServicesOfType:@"_http._tcp." inDomain:@"local."];
}
// ---------------------------------------------------------------------------
// shutdown
//
// Not to be confused with 'stop', this function is to be called when
// preparing to dispose the object. It handles shutting down our Bonjour
// stuff and so on. But, it does also stop the server if it's running.
// ---------------------------------------------------------------------------
- (void)shutdown
{
// shut down the firefly server
[self setStatus:kFireflyStatusStopping];
[self stop];
// Now shut down the Bonjour scan.
[netBrowser stop];
// FIXME: Is it safe to do this right after calling stop, or should we
// put these in didStop?
NSEnumerator *enumerator = [pendingNetServices objectEnumerator];
NSNetService *service;
while( service = [enumerator nextObject] )
[service stop];
[pendingNetServices removeAllObjects];
}
// ---------------------------------------------------------------------------
// setDelegate
//
// We will message our delegate when important things happen, like the server
// starting or stopping, etc.
// ---------------------------------------------------------------------------
- (void)setDelegate:(id) delegateToSet
{
delegate = delegateToSet;
}
// ---------------------------------------------------------------------------
// isRunning
//
// Is the server running?
// ---------------------------------------------------------------------------
- (BOOL)isRunning
{
BOOL retVal = NO;
if( nil != serverTask )
retVal = [serverTask isRunning];
return retVal;
}
// ---------------------------------------------------------------------------
// start
//
// Starts the server. Note that this function may fail if the server is
// already running.
// ---------------------------------------------------------------------------
- (BOOL)start
{
BOOL retVal = NO;
FireflyServerStatus curStatus = [self status];
if( curStatus == kFireflyStatusStopped ||
curStatus == kFireflyStatusStartFailed ||
curStatus == kFireflyStatusCrashed )
{
retVal = [self startAndUpdateStatus:YES];
}
return retVal;
}
// ---------------------------------------------------------------------------
// stop
//
// Signals the server to stop. Returns YES if the signal was sent successfully
// ---------------------------------------------------------------------------
- (BOOL)stop
{
BOOL retVal = NO;
if( nil != serverTask )
{
[self setStatus:kFireflyStatusStopping];
[serverTask terminate];
retVal = YES;
}
return retVal;
}
// ---------------------------------------------------------------------------
// restart
//
// restarts the server. Tells the server to shut down after setting our
// status to "restarting". When the server shuts down, the taskEnded
// method will see that status, and restart the server.
// ---------------------------------------------------------------------------
- (BOOL)restart
{
BOOL retVal = NO;
if( nil != serverTask )
{
[self setStatus:kFireflyStatusRestarting];
[serverTask terminate];
retVal = YES;
}
return retVal;
}
// ---------------------------------------------------------------------------
// status
//
// Returns the current server status
// ---------------------------------------------------------------------------
- (FireflyServerStatus)status
{
return status;
}
// ---------------------------------------------------------------------------
// version
//
// Returns the current server version, or nil if it's not yet known
// ---------------------------------------------------------------------------
- (NSString *)version
{
return serverVersion;
}
// ---------------------------------------------------------------------------
// configURL
//
// Returns the server's advanced user configuration URL, or nil if it's not
// yet known
// ---------------------------------------------------------------------------
- (NSString *)configURL
{
return serverURL;
}
// ===========================================================================
// Private utilities.
// ===========================================================================
// ---------------------------------------------------------------------------
// setStatus
//
// Sets the status and notifies interested parties of the change.
// ---------------------------------------------------------------------------
- (void)setStatus:(FireflyServerStatus) newStatus
{
status = newStatus;
[[NSNotificationCenter defaultCenter] postNotificationName:@STATUS_CHANGE
object:self];
}
// ---------------------------------------------------------------------------
// setURL
//
// Sets the server config URL and notifies interested parties of the change.
// ---------------------------------------------------------------------------
- (void)setURL:(NSString *) newUrl
{
[serverURL autorelease];
serverURL = [[NSString stringWithString:newUrl] retain];
[[NSNotificationCenter defaultCenter] postNotificationName:@URL_CHANGE
object:self];
}
// ---------------------------------------------------------------------------
// setVersion
//
// Sets the server version and notifies interested parties of the change.
// ---------------------------------------------------------------------------
- (void)setVersion:(NSString *)newVersion
{
[serverVersion autorelease];
serverVersion = [[NSString stringWithString:newVersion] retain];
[[NSNotificationCenter defaultCenter] postNotificationName:@VERSION_CHANGE
object:self];
}
// ---------------------------------------------------------------------------
// taskEnded
//
// We register this function to be called when tasks end. If the task is
// our server task, then we dispose the (now useless) object and notify
// interested parties of the change. We check for normal versus abnormal
// termination and set status accordingly.
// ---------------------------------------------------------------------------
- (void)taskEnded:(NSNotification *)notification
{
if( serverTask == [notification object] )
{
int termStatus = [[notification object] terminationStatus];
[serverTask autorelease];
serverTask = nil;
if( kFireflyStatusRestarting == status )
{
// Don't post the message saying that the server stopped;
// just start up and let the success or failure of that startup
// handle the status update.
[self startAndUpdateStatus:NO];
}
else
{
if( 0 == termStatus )
[self setStatus:kFireflyStatusStopped];
else if( kFireflyStatusStarting == status )
[self setStatus:kFireflyStatusStartFailed];
else
[self setStatus:kFireflyStatusCrashed];
NSLog(@"Server Task ended with status %d\n", termStatus);
}
}
}
// ---------------------------------------------------------------------------
// fireflyConfigFilePath
//
// Build the path to the config file, test that it's valid and return it. If
// we can't find a file at the expected location, we return nil
// ---------------------------------------------------------------------------
- (NSString*)fireflyConfigFilePath
{
NSString *retVal = nil;
NSArray * appSupportDirArray =
NSSearchPathForDirectoriesInDomains( NSLibraryDirectory,
NSUserDomainMask,
YES );
if( [appSupportDirArray count] > 0 )
{
BOOL bIsDir = NO;
NSFileManager *mgr = [NSFileManager defaultManager];
NSString *configFilePath =
[[appSupportDirArray objectAtIndex:0]
stringByAppendingPathComponent:@"Application Support/Firefly/"
FIREFLY_CONF_NAME];
if( [mgr fileExistsAtPath:configFilePath isDirectory:&bIsDir] && !bIsDir )
retVal = configFilePath;
}
return retVal;
}
// ---------------------------------------------------------------------------
// startAndUpdateStatus
//
// Private utility that actually starts the server. If the bUpdate flag is
// NO, then this utility will leave the current status in place, even though
// the server is starting. This is intended for use by the restart function,
// so that the status will remain in "restarting" until the server actually
// comes online (or fails)
// ---------------------------------------------------------------------------
- (BOOL)startAndUpdateStatus:(BOOL)bUpdate
{
BOOL retVal = NO;
[self killRunningFireflies];
NSString *configFilePath = [self fireflyConfigFilePath];
if( nil != configFilePath )
{
NSArray *array = [NSArray arrayWithObjects:
@"-y", @"-f", @"-c",
configFilePath,
@"-b",
[NSString stringWithUTF8String:ffid], // best 10.4<->10.3 compromise method...
nil];
@try
{
serverTask = [[[NSTask alloc] init] retain];
[serverTask setLaunchPath:fireflyServerPath];
[serverTask setCurrentDirectoryPath:[fireflyServerPath stringByDeletingLastPathComponent]];
[serverTask setArguments:array];
if( bUpdate )
[self setStatus:kFireflyStatusStarting];
[serverTask launch];
retVal = YES;
}
@catch( NSException *exception )
{
if( [[exception name] isEqual:NSInvalidArgumentException] )
;
NSLog(@"FireflyServer: Caught %@: %@", [exception name], [exception reason]);
[self setStatus:kFireflyStatusStartFailed];
}
}
else
{
NSLog(@"couldn't find config file at %@\n", configFilePath);
}
return retVal;
}
// ---------------------------------------------------------------------------
// killRunningFireflies
//
// This may seem like paranoia, but things really go badly if there is more
// than one copy of Firefly running (e.g. started from the command line, or
// failing to quit when signaled). So, we enforce some preconditions here.
// ---------------------------------------------------------------------------
- (void)killRunningFireflies
{
kinfo_proc *result;
size_t length;
GetProcesses( &result, &length );
// Okay, now we have our list of processes. Let's find OUR copy of
// firefly. Note that Firefly runs as multiple processes, so we look
// through all processes, not stopping when we find one. We *are*
// careful to only kill processes owned by the current user!
if( NULL != result )
{
int procCount = length / sizeof(kinfo_proc);
int i = 0;
uid_t ourUID = getuid();
for( ; i < procCount; i++ )
{
if( ourUID == result[i].kp_eproc.e_pcred.p_ruid &&
0 == strcasecmp( result[i].kp_proc.p_comm, FIREFLY_SERVER_NAME ) )
{
NSLog(@"Killing rogue firefly, pid %d\n", result[i].kp_proc.p_pid);
kill( result[i].kp_proc.p_pid, SIGKILL );
}
}
free( result );
}
}
// ===========================================================================
// Below are the delegate methods for Bonjour discovery of the server.
// ===========================================================================
// ---------------------------------------------------------------------------
// netServiceBrowserWillSearch:
//
// Lets us know that the Bonjour search has started
// ---------------------------------------------------------------------------
- (void)netServiceBrowserWillSearch:(NSNetServiceBrowser *)netServiceBrowser
{
#ifdef FIREFLY_DEBUG
NSLog(@"NSNetServiceBrowser started\n");
#endif
bScanIsActive = YES;
}
// ---------------------------------------------------------------------------
// netServiceBrowserDidStopSearch:
//
// Should only stop if we ask it to, as when we're quitting the app
// ---------------------------------------------------------------------------
- (void)netServiceBrowserDidStopSearch:(NSNetServiceBrowser *)netServiceBrowser
{
#ifdef FIREFLY_DEBUG
NSLog(@"NSNetServiceBrowser stopped\n");
#endif
bScanIsActive = NO;
}
// ---------------------------------------------------------------------------
// netServiceBrowser:didRemoveService:moreComing:
//
// Called when a Bonjour service goes away.
// ---------------------------------------------------------------------------
- (void)netServiceBrowser:(NSNetServiceBrowser *)netServiceBrowser
didRemoveService:(NSNetService *)netService
moreComing:(BOOL)moreServicesComing
{
// Is it our service? If so, we need to switch the status text and change
// the start/stop button, and also update the web page button and text.
if( [netService isEqual:fireflyService] )
{
[fireflyService autorelease];
fireflyService = nil;
// FIXME: AND? Theoretically, we should be notified that our NSTask
// went away, so this notification isn't needed to detect that the
// server stopped. But, what if due to some error, the Bonjour
// service croaked but left the server itself running?
}
}
// ---------------------------------------------------------------------------
// netServiceBrowser:didRemoveDomain:moreComing:
//
// unless our local host goes away, we really don't care.
// ---------------------------------------------------------------------------
- (void)netServiceBrowser:(NSNetServiceBrowser *)netServiceBrowser
didRemoveDomain:(NSString *)domainName
moreComing:(BOOL)moreDomainsComing
{
}
// ---------------------------------------------------------------------------
// netServiceBrowser:didNotSearch:
//
// Called if the search failed to start. We need to alert the user.
// ---------------------------------------------------------------------------
- (void)netServiceBrowser:(NSNetServiceBrowser *)netServiceBrowser
didNotSearch:(NSDictionary *)errorInfo
{
// FIXME: display error info? Try again? Quit?
}
// ---------------------------------------------------------------------------
// netServiceBrowser:didFindService:moreComing:
//
// A Bonjour service has been discovered. It might be our server. We need
// to ask the service to resolve, so we can see if it is.
// ---------------------------------------------------------------------------
- (void)netServiceBrowser:(NSNetServiceBrowser *)netServiceBrowser
didFindService:(NSNetService *)netService
moreComing:(BOOL)moreServicesComing
{
// We need to ask this object to resolve itself so we can figure out if it's the server
// we want. In case the user closes the panel, we need to have a list of all the ones
// pending so we can stop them.
[pendingNetServices addObject:netService];
[netService setDelegate:self];
[netService resolve];
if( !moreServicesComing )
bScanIsActive = NO;
}
// ---------------------------------------------------------------------------
// netServiceBrowser:didFindDomain:moreComing:
//
// Don't think we care about this one, but I'm pretty sure we're supposed to
// implement it (why?)
// ---------------------------------------------------------------------------
- (void)netServiceBrowser:(NSNetServiceBrowser *)netServiceBrowser
didFindDomain:(NSString *)domainName
moreComing:(BOOL)moreDomainsComing
{
}
// ---------------------------------------------------------------------------
// netServiceDidResolveAddress:
//
// We asked a service to resolve, and it has. Time to check to see if it's
// our server.
// ---------------------------------------------------------------------------
- (void)netServiceDidResolveAddress:(NSNetService *)service
{
// Is it a firefly service, and if so, is it ours?
// NOTE: EXTREMELY IMPORTANT!
// protocolSpecificInformation is a deprecated API, and the Tiger-on approved way is TXTRecordData.
// protocolSpecificInformation, though, is available back to 10.2. These return the data in
// DIFFERENT FORMATS. TXTRecordData returns the data in the mDNS-standard format of a packed
// array of Pascal strings, while protocolSpecificInformation returns the strings separated by 0x01
// characters. The TXTRecordContainsKey function and related utilities assume (at least on Tiger)
// the packed-Pascal format, so we have to use strstr instead. Happily, all we really care
// about here is that the ffid tag exists, so we don't need to do much parsing.
const char *version = NULL;
const char* txtRecordBytes = NULL;
NSData *data = nil;
NSString *txtRecord = [service protocolSpecificInformation];
if( nil != txtRecord )
data = [txtRecord dataUsingEncoding:NSUTF8StringEncoding];
txtRecordBytes = (const char*)[data bytes];
if( NULL != txtRecordBytes &&
NULL != ( version = strnstr( txtRecordBytes, "\001mtd-version=", [data length] ) ) )
{
// Okay, this is a firefly server. Let's see if it's *our* server
int i = 0;
char buf[256]; // max allowed size, but we'll still be careful not to overrun.
strncpy( buf, txtRecordBytes, 255 );
buf[255] = '\0';
#ifdef FIREFLY_DEBUG
NSLog( @"Text record is: %s\n", buf );
#endif
const char *ffidptr = strnstr( txtRecordBytes, "\001ffid=", [data length] );
if( NULL != ffidptr )
{
// This is a bit of a pain due to the stuff described in the big
// comment above.
// advance over the key
ffidptr += 6;
while( '\0' != ffidptr[i] &&
'\001' != ffidptr[i] &&
((ffidptr-txtRecordBytes)+i) < [data length] )
{
#ifdef FIREFLY_DEBUG
NSLog(@"Adding %c (%d)to ffidptr\n", ffidptr[i], ffidptr[i]);
#endif
buf[i] = ffidptr[i++];
}
buf[i] = '\0';
NSLog(@"Comparing buf %s against our ffid %s\n", buf, ffid);
if( 0 == strcmp( buf, ffid ) )
{
// WOOT! This is us. Get the version and port
i = 0;
version += 13;
while( '\0' != version[i] &&
'\001' != version[i] &&
((version-txtRecordBytes)+i) < [data length] )
buf[i] = version[i++];
buf[i] = '\0';
[self setVersion:[NSString stringWithUTF8String:buf]];
// Time to get the port.
NSArray *svcAddresses = [service addresses];
if( 0 != [svcAddresses count] )
{
NSData *addrData = [svcAddresses objectAtIndex:0];
struct sockaddr_in *addrPtr = (struct sockaddr_in*)[addrData bytes];
if( NULL != addrPtr )
{
serverPort = ntohs(addrPtr->sin_port);
[self setURL:[NSString stringWithFormat:@"http://localhost:%u", serverPort]];
}
}
// Okay, it's the one we want, so let's remember it and update
// our status
[fireflyService autorelease];
fireflyService = [service retain];
[self setStatus:kFireflyStatusActive];
#ifdef FIREFLY_DEBUG
NSBeep();
sleep(1);
NSBeep();
sleep(1);
NSBeep();
#endif
}
}
}
// It's no longer pending, so remove from array. If it was ours, we've
// retained it.
[pendingNetServices removeObject:service];
// If we're no longer scanning and we've exhausted all the
// services that we found without identifying the correct server,
// we need to ...?
if( !bScanIsActive && 0 == [pendingNetServices count] && nil == fireflyService )
; //FIXME
}
// ---------------------------------------------------------------------------
// netService:didNotResolve:
//
// We tried to resolve a service, and failed. It's probably not really
// running. We could always try again, but it doesn't seem to be necessary
// ---------------------------------------------------------------------------
- (void)netService:(NSNetService *)service didNotResolve:(NSDictionary *)errorInfo
{
[pendingNetServices removeObject:service];
#ifdef FIREFLY_DEBUG
if( nil == fireflyService )
NSLog(@"Failed to resolve service: %@\n", [errorInfo valueForKey:NSNetServicesErrorCode] );
#endif
}
// ---------------------------------------------------------------------------
// netServiceWillResolve:
//
// Just lets us know resolution has started.
// ---------------------------------------------------------------------------
- (void)netServiceWillResolve:(NSNetService *)service
{
}
@end
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