/* -*- Mode: C; tab-width: 4 -*- * * Copyright (c) 2002-2003 Apple Computer, Inc. All rights reserved. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include // For printf() #include // For strlen() etc. #include // For WaitNextEvent() #include // For SIOUXHandleOneEvent() #include "mDNSEmbeddedAPI.h" // Defines the interface to the client layer above #include "mDNSMacOS9.h" // Defines the specific types needed to run mDNS on this platform // These don't have to be globals, but their memory does need to remain valid for as // long as the search is going on. They are declared as globals here for simplicity. static mDNS m; static mDNS_PlatformSupport p; static ServiceRecordSet p1, p2; static AuthRecord availRec1, availRec2; static Boolean availRec2Active; // This sample code just calls mDNS_RenameAndReregisterService to automatically pick a new // unique name for the service. For a device such as a printer, this may be appropriate. // For a device with a user interface, and a screen, and a keyboard, the appropriate // response may be to prompt the user and ask them to choose a new name for the service. mDNSlocal void Callback(mDNS *const m, ServiceRecordSet *const sr, mStatus result) { switch (result) { case mStatus_NoError: debugf("Callback: %##s Name Registered", sr->RR_SRV.resrec.name.c); break; case mStatus_NameConflict: debugf("Callback: %##s Name Conflict", sr->RR_SRV.resrec.name.c); break; case mStatus_MemFree: debugf("Callback: %##s Memory Free", sr->RR_SRV.resrec.name.c); break; default: debugf("Callback: %##s Unknown Result %d", sr->RR_SRV.resrec.name.c, result); break; } if (result == mStatus_NameConflict) mDNS_RenameAndReregisterService(m, sr, mDNSNULL); } // RegisterService() is a simple wrapper function which takes C string // parameters, converts them to domainname parameters, and calls mDNS_RegisterService() mDNSlocal void RegisterService(mDNS *m, ServiceRecordSet *recordset, UInt16 PortAsNumber, const char txtinfo[], const domainlabel *const n, const char type[], const char domain[]) { domainname t; domainname d; char buffer[MAX_ESCAPED_DOMAIN_NAME]; UInt8 txtbuffer[512]; MakeDomainNameFromDNSNameString(&t, type); MakeDomainNameFromDNSNameString(&d, domain); if (txtinfo) { strncpy((char*)txtbuffer+1, txtinfo, sizeof(txtbuffer)-1); txtbuffer[0] = (UInt8)strlen(txtinfo); } else txtbuffer[0] = 0; mDNS_RegisterService(m, recordset, n, &t, &d, // Name, type, domain mDNSNULL, mDNSOpaque16fromIntVal(PortAsNumber), txtbuffer, (mDNSu16)(1+txtbuffer[0]), // TXT data, length mDNSNULL, 0, // Subtypes (none) mDNSInterface_Any, // Interface ID Callback, mDNSNULL, 0); // Callback, context, flags ConvertDomainNameToCString(recordset->RR_SRV.resrec.name, buffer); printf("Made Service Records for %s\n", buffer); } // RegisterFakeServiceForTesting() simulates the effect of services being registered on // dynamically-allocated port numbers. No real service exists on that port -- this is just for testing. mDNSlocal void RegisterFakeServiceForTesting(mDNS *m, ServiceRecordSet *recordset, const char txtinfo[], const char name[], const char type[], const char domain[]) { static UInt16 NextPort = 0xF000; domainlabel n; MakeDomainLabelFromLiteralString(&n, name); RegisterService(m, recordset, NextPort++, txtinfo, &n, type, domain); } // Done once on startup, and then again every time our address changes mDNSlocal OSStatus mDNSResponderTestSetup(mDNS *m) { char buffer[MAX_ESCAPED_DOMAIN_NAME]; mDNSv4Addr ip = m->HostInterfaces->ip.ip.v4; ConvertDomainNameToCString(&m->MulticastHostname, buffer); printf("Name %s\n", buffer); printf("IP %d.%d.%d.%d\n", ip.b[0], ip.b[1], ip.b[2], ip.b[3]); printf("\n"); printf("Registering Service Records\n"); // Create example printer discovery records //static ServiceRecordSet p1, p2; RegisterFakeServiceForTesting(m, &p1, "", "One", "_raop._tcp.", "local."); RegisterFakeServiceForTesting(m, &p2, "", "Two", "_raop._tcp.", "local."); return(kOTNoError); } mDNSlocal void AvailCallback(mDNS *const m, AuthRecord *const rr, mStatus result) { Boolean *b = (Boolean *)rr->RecordContext; (void)m; // Unused // Signal that our record is now free for re-use if (result == mStatus_MemFree) *b = false; } mDNSlocal OSStatus mDNSResponderSetAvail(mDNS *m, AuthRecord *rr, ServiceRecordSet *sr) { // 1. Initialize required fields of AuthRecord // 2. Set name of subtype PTR record to our special subtype name denoting "available" instances // 3. Set target of subtype PTR record to point to our SRV record (exactly the same as the main service PTR record) // 4. And register it mDNS_SetupResourceRecord(rr, mDNSNULL, mDNSInterface_Any, kDNSType_PTR, 2*3600, kDNSRecordTypeShared, AvailCallback, &availRec2Active); MakeDomainNameFromDNSNameString(rr->resrec.name, "a._sub._raop._tcp.local."); AssignDomainName(&rr->resrec.rdata->u.name, sr->RR_SRV.resrec.name); return(mDNS_Register(m, rr)); } // YieldSomeTime() just cooperatively yields some time to other processes running on classic Mac OS mDNSlocal Boolean YieldSomeTime(UInt32 milliseconds) { extern Boolean SIOUXQuitting; EventRecord e; WaitNextEvent(everyEvent, &e, milliseconds / 17, NULL); SIOUXHandleOneEvent(&e); return(SIOUXQuitting); } 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); }