mDNSlocal mStatus MainLoop(mDNS *m) // Loop until we quit.
{
sigset_t signals;
mDNSBool gotData = mDNSfalse;
mDNSPosixListenForSignalInEventLoop(SIGINT);
mDNSPosixListenForSignalInEventLoop(SIGTERM);
mDNSPosixListenForSignalInEventLoop(SIGUSR1);
mDNSPosixListenForSignalInEventLoop(SIGUSR2);
mDNSPosixListenForSignalInEventLoop(SIGINFO);
mDNSPosixListenForSignalInEventLoop(SIGPIPE);
mDNSPosixListenForSignalInEventLoop(SIGHUP) ;
for (; ;)
{
// Work out how long we expect to sleep before the next scheduled task
struct timeval timeout;
mDNSs32 ticks;
// Only idle if we didn't find any data the last time around
if (!gotData)
{
mDNSs32 nextTimerEvent = mDNS_Execute(m);
nextTimerEvent = udsserver_idle(nextTimerEvent);
ticks = nextTimerEvent - mDNS_TimeNow(m);
if (ticks < 1) ticks = 1;
}
else // otherwise call EventLoop again with 0 timemout
ticks = 0;
timeout.tv_sec = ticks / mDNSPlatformOneSecond;
timeout.tv_usec = (ticks % mDNSPlatformOneSecond) * 1000000 / mDNSPlatformOneSecond;
(void) mDNSPosixRunEventLoopOnce(m, &timeout, &signals, &gotData);
if (sigismember(&signals, SIGHUP )) Reconfigure(m);
if (sigismember(&signals, SIGINFO)) DumpStateLog(m);
if (sigismember(&signals, SIGUSR1)) ToggleLog();
if (sigismember(&signals, SIGUSR2)) ToggleLogPacket();
// SIGPIPE happens when we try to write to a dead client; death should be detected soon in request_callback() and cleaned up.
if (sigismember(&signals, SIGPIPE)) LogMsg("Received SIGPIPE - ignoring");
if (sigismember(&signals, SIGINT) || sigismember(&signals, SIGTERM)) break;
}
return EINTR;
}
int main()
{
mStatus err;
Boolean DoneSetup = false;
mDNSs32 nextAvail, nextBusy;
SIOUXSettings.asktosaveonclose = false;
SIOUXSettings.userwindowtitle = "\pMulticast DNS Responder";
printf("Multicast DNS Responder\n\n");
printf("This software reports errors using MacsBug breaks,\n");
printf("so if you don't have MacsBug installed your Mac may crash.\n\n");
printf("******************************************************************************\n");
err = InitOpenTransport();
if (err) { debugf("InitOpenTransport failed %d", err); return(err); }
err = mDNS_Init(&m, &p, mDNS_Init_NoCache, mDNS_Init_ZeroCacheSize,
mDNS_Init_AdvertiseLocalAddresses, mDNS_Init_NoInitCallback, mDNS_Init_NoInitCallbackContext);
if (err) return(err);
while (!YieldSomeTime(35))
{
#if MDNS_ONLYSYSTEMTASK
// For debugging, use "#define MDNS_ONLYSYSTEMTASK 1" and call mDNSPlatformIdle() periodically.
// For shipping code, don't define MDNS_ONLYSYSTEMTASK, and you don't need to call mDNSPlatformIdle()
extern void mDNSPlatformIdle(mDNS *const m);
mDNSPlatformIdle(&m); // Only needed for debugging version
#endif
if (m.mDNSPlatformStatus == mStatus_NoError && !DoneSetup)
{
DoneSetup = true;
printf("\nListening for mDNS queries...\n");
mDNSResponderTestSetup(&m);
mDNSResponderSetAvail(&m, &availRec1, &p1);
availRec2Active = false;
nextAvail = mDNS_TimeNow(&m) + mDNSPlatformOneSecond * 10;
nextBusy = mDNS_TimeNow(&m) + mDNSPlatformOneSecond * 15;
}
if (DoneSetup)
{
// We check availRec2.RecordType because we don't want to re-register this record
// if the previous mDNS_Deregister() has not yet completed
if (mDNS_TimeNow(&m) - nextAvail > 0 && !availRec2Active)
{
printf("Setting Two now available\n");
availRec2Active = true;
mDNSResponderSetAvail(&m, &availRec2, &p2);
nextAvail = nextBusy + mDNSPlatformOneSecond * 10;
}
else if (mDNS_TimeNow(&m) - nextBusy > 0)
{
printf("Setting Two now busy\n");
mDNS_Deregister(&m, &availRec2);
nextBusy = nextAvail + mDNSPlatformOneSecond * 5;
}
}
}
if (p1.RR_SRV.resrec.RecordType) mDNS_DeregisterService(&m, &p1);
if (p2.RR_SRV.resrec.RecordType) mDNS_DeregisterService(&m, &p2);
if (availRec1.resrec.RecordType) mDNS_Deregister(&m, &availRec1);
if (availRec2Active) mDNS_Deregister(&m, &availRec2);
mDNS_Close(&m);
return(0);
}
