mDNSMacOS9/Responder.c

   1 /*
   2  * Copyright (c) 2004 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22
  23     Change History (most recent first):
  24
  25 $Log: Responder.c,v $
  26 Revision 1.2  2004/05/20 18:38:31  cheshire
  27 Fix build broken by removal of 'kDNSServiceFlagsAutoRename' from dns_sd.h
  28
  29 Revision 1.1  2004/03/12 21:30:25  cheshire
  30 Build a System-Context Shared Library from mDNSCore, for the benefit of developers
  31 like Muse Research who want to be able to use mDNS/DNS-SD from GPL-licensed code.
  32
  33  */
  34
  35 #include <stdio.h>                                              // For printf()
  36 #include <string.h>                                             // For strcpy()
  37
  38 #include <Events.h>                                             // For WaitNextEvent()
  39
  40 #include <OpenTransport.h>
  41 #include <OpenTptInternet.h>
  42
  43 #include <SIOUX.h>                                              // For SIOUXHandleOneEvent()
  44
  45 #include "dns_sd.h"
  46
  47 typedef union { UInt8 b[2]; UInt16 NotAnInteger; } mDNSOpaque16;
  48 static UInt16 mDNSVal16(mDNSOpaque16 x) { return((UInt16)(x.b[0]<<8 | x.b[1])); }
  49 static mDNSOpaque16 mDNSOpaque16fromIntVal(UInt16 v)
  50         { mDNSOpaque16 x; x.b[0] = (UInt8)(v >> 8); x.b[1] = (UInt8)(v & 0xFF); return(x); }
  51
  52 typedef struct RegisteredService_struct RegisteredService;
  53 struct RegisteredService_struct
  54         {
  55         RegisteredService *next;
  56         DNSServiceRef sdRef;
  57         Boolean gotresult;
  58         DNSServiceErrorType errorCode;
  59         char namestr[64];
  60         char typestr[kDNSServiceMaxDomainName];
  61         char domstr [kDNSServiceMaxDomainName];
  62         };
  63
  64 static RegisteredService p1, p2, afp, http, njp;
  65 static RegisteredService *services = NULL, **nextservice = &services;
  66
  67 static void RegCallback(DNSServiceRef sdRef, DNSServiceFlags flags, DNSServiceErrorType errorCode,
  68                                                 const char *name, const char *regtype, const char *domain, void *context)
  69     {
  70     RegisteredService *rs = (RegisteredService *)context;
  71     (void)sdRef;        // Unused
  72     (void)flags;        // Unused
  73     rs->gotresult = true;
  74     rs->errorCode = errorCode;
  75     strcpy(rs->namestr, name);
  76     strcpy(rs->typestr, regtype);
  77     strcpy(rs->domstr,  domain);
  78     }
  79
  80 static DNSServiceErrorType RegisterService(RegisteredService *rs, mDNSOpaque16 OpaquePort,
  81         const char name[], const char type[], const char domain[], const char txtinfo[])
  82         {
  83         DNSServiceErrorType err;
  84         unsigned char txtbuffer[257];
  85         strncpy((char*)txtbuffer+1, txtinfo, 255);
  86         txtbuffer[256] = 0;
  87         txtbuffer[0] = (unsigned char)strlen((char*)txtbuffer);
  88         rs->gotresult = 0;
  89         rs->errorCode = kDNSServiceErr_NoError;
  90         err = DNSServiceRegister(&rs->sdRef, /* kDNSServiceFlagsAutoRename*/ 0, 0,
  91                 name, type, domain, NULL, OpaquePort.NotAnInteger, (unsigned short)(1+txtbuffer[0]), txtbuffer, RegCallback, rs);
  92         if (err)
  93                 printf("RegisterService(%s %s %s) failed %d\n", name, type, domain, err);
  94         else
  95                 { *nextservice = rs; nextservice = &rs->next; }
  96         return(err);
  97         }
  98
  99 // RegisterFakeServiceForTesting() simulates the effect of services being registered on
 100 // dynamically-allocated port numbers. No real service exists on that port -- this is just for testing.
 101 static DNSServiceErrorType RegisterFakeServiceForTesting(RegisteredService *rs,
 102         const char name[], const char type[], const char domain[], const char txtinfo[])
 103         {
 104         static UInt16 NextPort = 0xF000;
 105         return RegisterService(rs, mDNSOpaque16fromIntVal(NextPort++), name, type, domain, txtinfo);
 106         }
 107
 108 // CreateProxyRegistrationForRealService() checks to see if the given port is currently
 109 // in use, and if so, advertises the specified service as present on that port.
 110 // This is useful for advertising existing real services (Personal Web Sharing, Personal
 111 // File Sharing, etc.) that currently don't register with mDNS Service Discovery themselves.
 112 static DNSServiceErrorType CreateProxyRegistrationForRealService(RegisteredService *rs,
 113         const char *servicetype, UInt16 PortAsNumber, const char txtinfo[])
 114         {
 115         mDNSOpaque16 OpaquePort = mDNSOpaque16fromIntVal(PortAsNumber);
 116         InetAddress ia;
 117         TBind bindReq;
 118         OSStatus err;
 119         TEndpointInfo endpointinfo;
 120         EndpointRef ep = OTOpenEndpoint(OTCreateConfiguration(kTCPName), 0, &endpointinfo, &err);
 121         if (!ep || err) { printf("OTOpenEndpoint (CreateProxyRegistrationForRealService) failed %d", err); return(err); }
 122
 123         ia.fAddressType = AF_INET;
 124         ia.fPort        = OpaquePort.NotAnInteger;
 125         ia.fHost        = 0;
 126         bindReq.addr.maxlen = sizeof(ia);
 127         bindReq.addr.len    = sizeof(ia);
 128         bindReq.addr.buf    = (UInt8*)&ia;
 129         bindReq.qlen        = 0;
 130         err = OTBind(ep, &bindReq, NULL);
 131
 132         if (err == kOTBadAddressErr)
 133                 err = RegisterService(rs, OpaquePort, "", servicetype, "local.", txtinfo);
 134         else if (err)
 135                 printf("OTBind failed %d", err);
 136
 137         OTCloseProvider(ep);
 138         return(err);
 139         }
 140
 141 // YieldSomeTime() just cooperatively yields some time to other processes running on classic Mac OS
 142 static Boolean YieldSomeTime(UInt32 milliseconds)
 143         {
 144         extern Boolean SIOUXQuitting;
 145         EventRecord e;
 146         WaitNextEvent(everyEvent, &e, milliseconds / 17, NULL);
 147         SIOUXHandleOneEvent(&e);
 148         return(SIOUXQuitting);
 149         }
 150
 151 int main()
 152         {
 153         OSStatus err;
 154         RegisteredService *s;
 155
 156         SIOUXSettings.asktosaveonclose = false;
 157         SIOUXSettings.userwindowtitle = "\pMulticast DNS Responder";
 158
 159         printf("Multicast DNS Responder\n\n");
 160         printf("This software reports errors using MacsBug breaks,\n");
 161         printf("so if you don't have MacsBug installed your Mac may crash.\n\n");
 162         printf("******************************************************************************\n\n");
 163
 164         err = InitOpenTransport();
 165         if (err) { printf("InitOpenTransport failed %d", err); return(err); }
 166
 167         printf("Advertising Services...\n");
 168
 169 #define SRSET 0
 170 #if SRSET==0
 171         RegisterFakeServiceForTesting(&p1, "Web Server One", "_http._tcp.", "local.", "path=/index.html");
 172         RegisterFakeServiceForTesting(&p2, "Web Server Two", "_http._tcp.", "local.", "path=/path.html");
 173 #elif SRSET==1
 174         RegisterFakeServiceForTesting(&p1, "Epson Stylus 900N", "_printer._tcp.", "local.", "rn=lpq1");
 175         RegisterFakeServiceForTesting(&p2, "HP LaserJet",       "_printer._tcp.", "local.", "rn=lpq2");
 176 #else
 177         RegisterFakeServiceForTesting(&p1, "My Printer",        "_printer._tcp.", "local.", "rn=lpq3");
 178         RegisterFakeServiceForTesting(&p2, "My Other Printer",  "_printer._tcp.", "local.", "lrn=pq4");
 179 #endif
 180
 181         // If AFP Server is running, register a record for it
 182         CreateProxyRegistrationForRealService(&afp, "_afpovertcp._tcp.", 548, "");
 183
 184         // If Web Server is running, register a record for it
 185         CreateProxyRegistrationForRealService(&http, "_http._tcp.",       80, "path=/index.html");
 186
 187         while (!YieldSomeTime(35))
 188                 for (s = services; s; s = s->next)
 189                         if (s->gotresult)
 190                                 {
 191                                 printf("%s %s %s registered\n", s->namestr, s->typestr, s->domstr);
 192                                 s->gotresult = false;
 193                                 }
 194
 195         for (s = services; s; s = s->next)
 196                 if (s->sdRef) DNSServiceRefDeallocate(s->sdRef);
 197
 198         CloseOpenTransport();
 199         return(0);
 200         }