406 lines
14 KiB
C
406 lines
14 KiB
C
/**
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* Copyright (C) 2011-2012 Juho Vähä-Herttua
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*/
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/* These defines allow us to compile on iOS */
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#ifndef __has_feature
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# define __has_feature(x) 0
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#endif
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#ifndef __has_extension
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# define __has_extension __has_feature
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#endif
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <assert.h>
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "dnssdint.h"
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#include "dnssd.h"
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#include "global.h"
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#include "compat.h"
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#include "utils.h"
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#include <dns_sd.h>
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#define MAX_DEVICEID 18
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#define MAX_SERVNAME 256
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#if defined(HAVE_LIBDL) && !defined(__APPLE__)
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# define USE_LIBDL 1
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#else
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# define USE_LIBDL 0
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#endif
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#if defined(WIN32) || USE_LIBDL
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# ifdef WIN32
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# include <stdint.h>
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# if !defined(EFI32) && !defined(EFI64)
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# define DNSSD_STDCALL __stdcall
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# else
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# define DNSSD_STDCALL
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# endif
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# else
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# include <dlfcn.h>
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# define DNSSD_STDCALL
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# endif
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typedef struct _DNSServiceRef_t *DNSServiceRef;
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typedef union _TXTRecordRef_t { char PrivateData[16]; char *ForceNaturalAlignment; } TXTRecordRef;
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typedef uint32_t DNSServiceFlags;
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typedef int32_t DNSServiceErrorType;
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typedef void (DNSSD_STDCALL *DNSServiceRegisterReply)
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(
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DNSServiceRef sdRef,
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DNSServiceFlags flags,
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DNSServiceErrorType errorCode,
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const char *name,
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const char *regtype,
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const char *domain,
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void *context
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);
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#else
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//# include <dns_sd.h>
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# define DNSSD_STDCALL
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#endif
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typedef DNSServiceErrorType (DNSSD_STDCALL *DNSServiceRegister_t)
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(
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DNSServiceRef *sdRef,
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DNSServiceFlags flags,
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uint32_t interfaceIndex,
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const char *name,
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const char *regtype,
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const char *domain,
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const char *host,
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uint16_t port,
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uint16_t txtLen,
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const void *txtRecord,
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DNSServiceRegisterReply callBack,
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void *context
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);
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typedef void (DNSSD_STDCALL *DNSServiceRefDeallocate_t)(DNSServiceRef sdRef);
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typedef void (DNSSD_STDCALL *TXTRecordCreate_t)
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(
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TXTRecordRef *txtRecord,
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uint16_t bufferLen,
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void *buffer
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);
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typedef void (DNSSD_STDCALL *TXTRecordDeallocate_t)(TXTRecordRef *txtRecord);
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typedef DNSServiceErrorType (DNSSD_STDCALL *TXTRecordSetValue_t)
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(
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TXTRecordRef *txtRecord,
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const char *key,
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uint8_t valueSize,
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const void *value
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);
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typedef uint16_t (DNSSD_STDCALL *TXTRecordGetLength_t)(const TXTRecordRef *txtRecord);
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typedef const void * (DNSSD_STDCALL *TXTRecordGetBytesPtr_t)(const TXTRecordRef *txtRecord);
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struct dnssd_s {
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#ifdef WIN32
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HMODULE module;
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#elif USE_LIBDL
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void *module;
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#endif
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DNSServiceRegister_t DNSServiceRegister;
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DNSServiceRefDeallocate_t DNSServiceRefDeallocate;
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TXTRecordCreate_t TXTRecordCreate;
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TXTRecordSetValue_t TXTRecordSetValue;
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TXTRecordGetLength_t TXTRecordGetLength;
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TXTRecordGetBytesPtr_t TXTRecordGetBytesPtr;
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TXTRecordDeallocate_t TXTRecordDeallocate;
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TXTRecordRef raop_record;
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TXTRecordRef airplay_record;
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DNSServiceRef raop_service;
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DNSServiceRef airplay_service;
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char *name;
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int name_len;
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char *hw_addr;
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int hw_addr_len;
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};
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dnssd_t *
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dnssd_init(const char* name, int name_len, const char* hw_addr, int hw_addr_len, int *error)
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{
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dnssd_t *dnssd;
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if (error) *error = DNSSD_ERROR_NOERROR;
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dnssd = calloc(1, sizeof(dnssd_t));
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if (!dnssd) {
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if (error) *error = DNSSD_ERROR_OUTOFMEM;
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return NULL;
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}
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#ifdef WIN32
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dnssd->module = LoadLibraryA("dnssd.dll");
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if (!dnssd->module) {
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if (error) *error = DNSSD_ERROR_LIBNOTFOUND;
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free(dnssd);
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return NULL;
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}
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dnssd->DNSServiceRegister = (DNSServiceRegister_t)GetProcAddress(dnssd->module, "DNSServiceRegister");
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dnssd->DNSServiceRefDeallocate = (DNSServiceRefDeallocate_t)GetProcAddress(dnssd->module, "DNSServiceRefDeallocate");
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dnssd->TXTRecordCreate = (TXTRecordCreate_t)GetProcAddress(dnssd->module, "TXTRecordCreate");
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dnssd->TXTRecordSetValue = (TXTRecordSetValue_t)GetProcAddress(dnssd->module, "TXTRecordSetValue");
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dnssd->TXTRecordGetLength = (TXTRecordGetLength_t)GetProcAddress(dnssd->module, "TXTRecordGetLength");
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dnssd->TXTRecordGetBytesPtr = (TXTRecordGetBytesPtr_t)GetProcAddress(dnssd->module, "TXTRecordGetBytesPtr");
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dnssd->TXTRecordDeallocate = (TXTRecordDeallocate_t)GetProcAddress(dnssd->module, "TXTRecordDeallocate");
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if (!dnssd->DNSServiceRegister || !dnssd->DNSServiceRefDeallocate || !dnssd->TXTRecordCreate ||
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!dnssd->TXTRecordSetValue || !dnssd->TXTRecordGetLength || !dnssd->TXTRecordGetBytesPtr ||
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!dnssd->TXTRecordDeallocate) {
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if (error) *error = DNSSD_ERROR_PROCNOTFOUND;
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FreeLibrary(dnssd->module);
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free(dnssd);
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return NULL;
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}
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#elif USE_LIBDL
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dnssd->module = dlopen("libdns_sd.so", RTLD_LAZY);
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if (!dnssd->module) {
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if (error) *error = DNSSD_ERROR_LIBNOTFOUND;
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free(dnssd);
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return NULL;
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}
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dnssd->DNSServiceRegister = (DNSServiceRegister_t)dlsym(dnssd->module, "DNSServiceRegister");
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dnssd->DNSServiceRefDeallocate = (DNSServiceRefDeallocate_t)dlsym(dnssd->module, "DNSServiceRefDeallocate");
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dnssd->TXTRecordCreate = (TXTRecordCreate_t)dlsym(dnssd->module, "TXTRecordCreate");
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dnssd->TXTRecordSetValue = (TXTRecordSetValue_t)dlsym(dnssd->module, "TXTRecordSetValue");
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dnssd->TXTRecordGetLength = (TXTRecordGetLength_t)dlsym(dnssd->module, "TXTRecordGetLength");
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dnssd->TXTRecordGetBytesPtr = (TXTRecordGetBytesPtr_t)dlsym(dnssd->module, "TXTRecordGetBytesPtr");
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dnssd->TXTRecordDeallocate = (TXTRecordDeallocate_t)dlsym(dnssd->module, "TXTRecordDeallocate");
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if (!dnssd->DNSServiceRegister || !dnssd->DNSServiceRefDeallocate || !dnssd->TXTRecordCreate ||
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!dnssd->TXTRecordSetValue || !dnssd->TXTRecordGetLength || !dnssd->TXTRecordGetBytesPtr ||
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!dnssd->TXTRecordDeallocate) {
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if (error) *error = DNSSD_ERROR_PROCNOTFOUND;
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dlclose(dnssd->module);
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free(dnssd);
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return NULL;
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}
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#else
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dnssd->DNSServiceRegister = &DNSServiceRegister;
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dnssd->DNSServiceRefDeallocate = &DNSServiceRefDeallocate;
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dnssd->TXTRecordCreate = &TXTRecordCreate;
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dnssd->TXTRecordSetValue = &TXTRecordSetValue;
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dnssd->TXTRecordGetLength = &TXTRecordGetLength;
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dnssd->TXTRecordGetBytesPtr = &TXTRecordGetBytesPtr;
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dnssd->TXTRecordDeallocate = &TXTRecordDeallocate;
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#endif
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dnssd->name_len = name_len;
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dnssd->name = calloc(1, name_len);
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if (!dnssd->name) {
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free(dnssd);
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if (error) *error = DNSSD_ERROR_OUTOFMEM;
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return NULL;
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}
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memcpy(dnssd->name, name, name_len);
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dnssd->hw_addr_len = hw_addr_len;
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dnssd->hw_addr = calloc(1, dnssd->hw_addr_len);
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if (!dnssd->hw_addr) {
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free(dnssd->name);
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free(dnssd);
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if (error) *error = DNSSD_ERROR_OUTOFMEM;
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return NULL;
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}
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memcpy(dnssd->hw_addr, hw_addr, hw_addr_len);
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return dnssd;
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}
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void
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dnssd_destroy(dnssd_t *dnssd)
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{
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if (dnssd) {
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#ifdef WIN32
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FreeLibrary(dnssd->module);
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#elif USE_LIBDL
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dlclose(dnssd->module);
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#endif
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free(dnssd);
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}
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}
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int
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dnssd_register_raop(dnssd_t *dnssd, unsigned short port)
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{
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char servname[MAX_SERVNAME];
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assert(dnssd);
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dnssd->TXTRecordCreate(&dnssd->raop_record, 0, NULL);
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dnssd->TXTRecordSetValue(&dnssd->raop_record, "ch", strlen(RAOP_CH), RAOP_CH);
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dnssd->TXTRecordSetValue(&dnssd->raop_record, "cn", strlen(RAOP_CN), RAOP_CN);
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dnssd->TXTRecordSetValue(&dnssd->raop_record, "da", strlen(RAOP_DA), RAOP_DA);
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dnssd->TXTRecordSetValue(&dnssd->raop_record, "et", strlen(RAOP_ET), RAOP_ET);
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dnssd->TXTRecordSetValue(&dnssd->raop_record, "vv", strlen(RAOP_VV), RAOP_VV);
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dnssd->TXTRecordSetValue(&dnssd->raop_record, "ft", strlen(RAOP_FT), RAOP_FT);
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dnssd->TXTRecordSetValue(&dnssd->raop_record, "am", strlen(GLOBAL_MODEL), GLOBAL_MODEL);
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dnssd->TXTRecordSetValue(&dnssd->raop_record, "md", strlen(RAOP_MD), RAOP_MD);
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dnssd->TXTRecordSetValue(&dnssd->raop_record, "rhd", strlen(RAOP_RHD), RAOP_RHD);
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dnssd->TXTRecordSetValue(&dnssd->raop_record, "pw", strlen("false"), "false");
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dnssd->TXTRecordSetValue(&dnssd->raop_record, "sr", strlen(RAOP_SR), RAOP_SR);
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dnssd->TXTRecordSetValue(&dnssd->raop_record, "ss", strlen(RAOP_SS), RAOP_SS);
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dnssd->TXTRecordSetValue(&dnssd->raop_record, "sv", strlen(RAOP_SV), RAOP_SV);
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dnssd->TXTRecordSetValue(&dnssd->raop_record, "tp", strlen(RAOP_TP), RAOP_TP);
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dnssd->TXTRecordSetValue(&dnssd->raop_record, "txtvers", strlen(RAOP_TXTVERS), RAOP_TXTVERS);
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dnssd->TXTRecordSetValue(&dnssd->raop_record, "sf", strlen(RAOP_SF), RAOP_SF);
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dnssd->TXTRecordSetValue(&dnssd->raop_record, "vs", strlen(RAOP_VS), RAOP_VS);
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dnssd->TXTRecordSetValue(&dnssd->raop_record, "vn", strlen(RAOP_VN), RAOP_VN);
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dnssd->TXTRecordSetValue(&dnssd->raop_record, "pk", strlen(RAOP_PK), RAOP_PK);
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/* Convert hardware address to string */
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if (utils_hwaddr_raop(servname, sizeof(servname), dnssd->hw_addr, dnssd->hw_addr_len) < 0) {
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/* FIXME: handle better */
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return -1;
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}
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/* Check that we have bytes for 'hw@name' format */
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if (sizeof(servname) < strlen(servname) + 1 + dnssd->name_len + 1) {
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/* FIXME: handle better */
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return -2;
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}
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strncat(servname, "@", sizeof(servname)-strlen(servname)-1);
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strncat(servname, dnssd->name, sizeof(servname)-strlen(servname)-1);
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/* Register the service */
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dnssd->DNSServiceRegister(&dnssd->raop_service, 0, 0,
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servname, "_raop._tcp",
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NULL, NULL,
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htons(port),
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dnssd->TXTRecordGetLength(&dnssd->raop_record),
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dnssd->TXTRecordGetBytesPtr(&dnssd->raop_record),
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NULL, NULL);
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return 1;
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}
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int
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dnssd_register_airplay(dnssd_t *dnssd, unsigned short port)
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{
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char device_id[3 * MAX_HWADDR_LEN];
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assert(dnssd);
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/* Convert hardware address to string */
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if (utils_hwaddr_airplay(device_id, sizeof(device_id), dnssd->hw_addr, dnssd->hw_addr_len) < 0) {
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/* FIXME: handle better */
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return -1;
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}
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dnssd->TXTRecordCreate(&dnssd->airplay_record, 0, NULL);
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dnssd->TXTRecordSetValue(&dnssd->airplay_record, "deviceid", strlen(device_id), device_id);
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dnssd->TXTRecordSetValue(&dnssd->airplay_record, "features", strlen(AIRPLAY_FEATURES), AIRPLAY_FEATURES);
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dnssd->TXTRecordSetValue(&dnssd->airplay_record, "flags", strlen(AIRPLAY_FLAGS), AIRPLAY_FLAGS);
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dnssd->TXTRecordSetValue(&dnssd->airplay_record, "model", strlen(GLOBAL_MODEL), GLOBAL_MODEL);
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dnssd->TXTRecordSetValue(&dnssd->airplay_record, "pk", strlen(AIRPLAY_PK), AIRPLAY_PK);
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dnssd->TXTRecordSetValue(&dnssd->airplay_record, "pi", strlen(AIRPLAY_PI), AIRPLAY_PI);
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dnssd->TXTRecordSetValue(&dnssd->airplay_record, "srcvers", strlen(AIRPLAY_SRCVERS), AIRPLAY_SRCVERS);
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dnssd->TXTRecordSetValue(&dnssd->airplay_record, "vv", strlen(AIRPLAY_VV), AIRPLAY_VV);
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/* Register the service */
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dnssd->DNSServiceRegister(&dnssd->airplay_service, 0, 0,
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dnssd->name, "_airplay._tcp",
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NULL, NULL,
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htons(port),
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dnssd->TXTRecordGetLength(&dnssd->airplay_record),
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dnssd->TXTRecordGetBytesPtr(&dnssd->airplay_record),
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NULL, NULL);
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return 1;
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}
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const char *
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dnssd_get_airplay_txt(dnssd_t *dnssd, int *length)
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{
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*length = dnssd->TXTRecordGetLength(&dnssd->airplay_record);
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return dnssd->TXTRecordGetBytesPtr(&dnssd->airplay_record);
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}
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const char *
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dnssd_get_name(dnssd_t *dnssd, int *length)
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{
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*length = dnssd->name_len;
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return dnssd->name;
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}
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const char *
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dnssd_get_hw_addr(dnssd_t *dnssd, int *length)
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{
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*length = dnssd->hw_addr_len;
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return dnssd->hw_addr;
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}
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void
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dnssd_unregister_raop(dnssd_t *dnssd)
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{
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assert(dnssd);
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if (!dnssd->raop_service) {
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return;
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}
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/* Deallocate TXT record */
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dnssd->TXTRecordDeallocate(&dnssd->raop_record);
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dnssd->DNSServiceRefDeallocate(dnssd->raop_service);
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dnssd->raop_service = NULL;
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if (dnssd->airplay_service == NULL) {
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free(dnssd->name);
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free(dnssd->hw_addr);
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}
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}
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void
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dnssd_unregister_airplay(dnssd_t *dnssd)
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{
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assert(dnssd);
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if (!dnssd->airplay_service) {
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return;
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}
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/* Deallocate TXT record */
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dnssd->TXTRecordDeallocate(&dnssd->airplay_record);
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dnssd->DNSServiceRefDeallocate(dnssd->airplay_service);
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dnssd->airplay_service = NULL;
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if (dnssd->raop_service == NULL) {
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free(dnssd->name);
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free(dnssd->hw_addr);
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}
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} |