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23e7e3ae JVH |
1 | /** |
2 | * Copyright (C) 2011-2012 Juho Vähä-Herttua | |
3 | * | |
4 | * This library is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU Lesser General Public | |
6 | * License as published by the Free Software Foundation; either | |
7 | * version 2.1 of the License, or (at your option) any later version. | |
8 | * | |
9 | * This library is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * Lesser General Public License for more details. | |
13 | */ | |
14 | ||
53aa6852 JVH |
15 | /* These defines allow us to compile on iOS */ |
16 | #ifndef __has_feature | |
17 | # define __has_feature(x) 0 | |
18 | #endif | |
19 | #ifndef __has_extension | |
20 | # define __has_extension __has_feature | |
21 | #endif | |
22 | ||
2340bcd3 JVH |
23 | #include <stdlib.h> |
24 | #include <string.h> | |
25 | #include <stdio.h> | |
26 | #include <assert.h> | |
27 | ||
bbb0ec36 | 28 | #ifdef HAVE_CONFIG_H |
92a5fb67 | 29 | #include "config.h" |
bbb0ec36 | 30 | #endif |
92a5fb67 | 31 | |
2340bcd3 JVH |
32 | #include "dnssd.h" |
33 | #include "dnssdint.h" | |
34 | #include "global.h" | |
35 | #include "compat.h" | |
36 | #include "utils.h" | |
37 | ||
38 | #define MAX_DEVICEID 18 | |
39 | #define MAX_SERVNAME 256 | |
40 | ||
6da21350 JVH |
41 | #define USE_LIBDL (defined(HAVE_LIBDL) && !defined(__APPLE__)) |
42 | ||
43 | #if defined(WIN32) || USE_LIBDL | |
44 | # ifdef WIN32 | |
45 | # include <stdint.h> | |
46 | # if !defined(EFI32) && !defined(EFI64) | |
47 | # define DNSSD_STDCALL __stdcall | |
48 | # else | |
49 | # define DNSSD_STDCALL | |
50 | # endif | |
2340bcd3 | 51 | # else |
6da21350 | 52 | # include <dlfcn.h> |
427cd9fb | 53 | # define DNSSD_STDCALL |
2340bcd3 JVH |
54 | # endif |
55 | ||
56 | typedef struct _DNSServiceRef_t *DNSServiceRef; | |
57 | typedef union _TXTRecordRef_t { char PrivateData[16]; char *ForceNaturalAlignment; } TXTRecordRef; | |
58 | ||
59 | typedef uint32_t DNSServiceFlags; | |
60 | typedef int32_t DNSServiceErrorType; | |
61 | ||
427cd9fb | 62 | typedef void (DNSSD_STDCALL *DNSServiceRegisterReply) |
2340bcd3 JVH |
63 | ( |
64 | DNSServiceRef sdRef, | |
65 | DNSServiceFlags flags, | |
66 | DNSServiceErrorType errorCode, | |
67 | const char *name, | |
68 | const char *regtype, | |
69 | const char *domain, | |
70 | void *context | |
71 | ); | |
6da21350 JVH |
72 | |
73 | #else | |
74 | # include <dns_sd.h> | |
75 | # define DNSSD_STDCALL | |
2340bcd3 JVH |
76 | #endif |
77 | ||
427cd9fb | 78 | typedef DNSServiceErrorType (DNSSD_STDCALL *DNSServiceRegister_t) |
2340bcd3 JVH |
79 | ( |
80 | DNSServiceRef *sdRef, | |
81 | DNSServiceFlags flags, | |
82 | uint32_t interfaceIndex, | |
83 | const char *name, | |
84 | const char *regtype, | |
85 | const char *domain, | |
86 | const char *host, | |
87 | uint16_t port, | |
88 | uint16_t txtLen, | |
89 | const void *txtRecord, | |
90 | DNSServiceRegisterReply callBack, | |
91 | void *context | |
92 | ); | |
427cd9fb JVH |
93 | typedef void (DNSSD_STDCALL *DNSServiceRefDeallocate_t)(DNSServiceRef sdRef); |
94 | typedef void (DNSSD_STDCALL *TXTRecordCreate_t) | |
2340bcd3 JVH |
95 | ( |
96 | TXTRecordRef *txtRecord, | |
97 | uint16_t bufferLen, | |
98 | void *buffer | |
99 | ); | |
427cd9fb JVH |
100 | typedef void (DNSSD_STDCALL *TXTRecordDeallocate_t)(TXTRecordRef *txtRecord); |
101 | typedef DNSServiceErrorType (DNSSD_STDCALL *TXTRecordSetValue_t) | |
2340bcd3 JVH |
102 | ( |
103 | TXTRecordRef *txtRecord, | |
104 | const char *key, | |
105 | uint8_t valueSize, | |
106 | const void *value | |
107 | ); | |
427cd9fb JVH |
108 | typedef uint16_t (DNSSD_STDCALL *TXTRecordGetLength_t)(const TXTRecordRef *txtRecord); |
109 | typedef const void * (DNSSD_STDCALL *TXTRecordGetBytesPtr_t)(const TXTRecordRef *txtRecord); | |
2340bcd3 JVH |
110 | |
111 | ||
112 | struct dnssd_s { | |
113 | #ifdef WIN32 | |
114 | HMODULE module; | |
6da21350 JVH |
115 | #elif USE_LIBDL |
116 | void *module; | |
2340bcd3 JVH |
117 | #endif |
118 | ||
119 | DNSServiceRegister_t DNSServiceRegister; | |
120 | DNSServiceRefDeallocate_t DNSServiceRefDeallocate; | |
121 | TXTRecordCreate_t TXTRecordCreate; | |
122 | TXTRecordSetValue_t TXTRecordSetValue; | |
123 | TXTRecordGetLength_t TXTRecordGetLength; | |
124 | TXTRecordGetBytesPtr_t TXTRecordGetBytesPtr; | |
125 | TXTRecordDeallocate_t TXTRecordDeallocate; | |
126 | ||
2340bcd3 JVH |
127 | DNSServiceRef raopService; |
128 | DNSServiceRef airplayService; | |
129 | }; | |
130 | ||
131 | ||
132 | ||
133 | dnssd_t * | |
067f00ef | 134 | dnssd_init(int *error) |
2340bcd3 JVH |
135 | { |
136 | dnssd_t *dnssd; | |
137 | ||
138 | if (error) *error = DNSSD_ERROR_NOERROR; | |
2340bcd3 JVH |
139 | |
140 | dnssd = calloc(1, sizeof(dnssd_t)); | |
141 | if (!dnssd) { | |
142 | if (error) *error = DNSSD_ERROR_OUTOFMEM; | |
143 | return NULL; | |
144 | } | |
145 | ||
146 | #ifdef WIN32 | |
147 | dnssd->module = LoadLibraryA("dnssd.dll"); | |
148 | if (!dnssd->module) { | |
149 | if (error) *error = DNSSD_ERROR_LIBNOTFOUND; | |
150 | free(dnssd); | |
151 | return NULL; | |
152 | } | |
153 | dnssd->DNSServiceRegister = (DNSServiceRegister_t)GetProcAddress(dnssd->module, "DNSServiceRegister"); | |
154 | dnssd->DNSServiceRefDeallocate = (DNSServiceRefDeallocate_t)GetProcAddress(dnssd->module, "DNSServiceRefDeallocate"); | |
155 | dnssd->TXTRecordCreate = (TXTRecordCreate_t)GetProcAddress(dnssd->module, "TXTRecordCreate"); | |
156 | dnssd->TXTRecordSetValue = (TXTRecordSetValue_t)GetProcAddress(dnssd->module, "TXTRecordSetValue"); | |
157 | dnssd->TXTRecordGetLength = (TXTRecordGetLength_t)GetProcAddress(dnssd->module, "TXTRecordGetLength"); | |
158 | dnssd->TXTRecordGetBytesPtr = (TXTRecordGetBytesPtr_t)GetProcAddress(dnssd->module, "TXTRecordGetBytesPtr"); | |
159 | dnssd->TXTRecordDeallocate = (TXTRecordDeallocate_t)GetProcAddress(dnssd->module, "TXTRecordDeallocate"); | |
160 | ||
161 | if (!dnssd->DNSServiceRegister || !dnssd->DNSServiceRefDeallocate || !dnssd->TXTRecordCreate || | |
162 | !dnssd->TXTRecordSetValue || !dnssd->TXTRecordGetLength || !dnssd->TXTRecordGetBytesPtr || | |
163 | !dnssd->TXTRecordDeallocate) { | |
164 | if (error) *error = DNSSD_ERROR_PROCNOTFOUND; | |
165 | FreeLibrary(dnssd->module); | |
166 | free(dnssd); | |
167 | return NULL; | |
168 | } | |
6da21350 JVH |
169 | #elif USE_LIBDL |
170 | dnssd->module = dlopen("libdns_sd.so", RTLD_LAZY); | |
171 | if (!dnssd->module) { | |
172 | if (error) *error = DNSSD_ERROR_LIBNOTFOUND; | |
173 | free(dnssd); | |
174 | return NULL; | |
175 | } | |
176 | dnssd->DNSServiceRegister = (DNSServiceRegister_t)dlsym(dnssd->module, "DNSServiceRegister"); | |
177 | dnssd->DNSServiceRefDeallocate = (DNSServiceRefDeallocate_t)dlsym(dnssd->module, "DNSServiceRefDeallocate"); | |
178 | dnssd->TXTRecordCreate = (TXTRecordCreate_t)dlsym(dnssd->module, "TXTRecordCreate"); | |
179 | dnssd->TXTRecordSetValue = (TXTRecordSetValue_t)dlsym(dnssd->module, "TXTRecordSetValue"); | |
180 | dnssd->TXTRecordGetLength = (TXTRecordGetLength_t)dlsym(dnssd->module, "TXTRecordGetLength"); | |
181 | dnssd->TXTRecordGetBytesPtr = (TXTRecordGetBytesPtr_t)dlsym(dnssd->module, "TXTRecordGetBytesPtr"); | |
182 | dnssd->TXTRecordDeallocate = (TXTRecordDeallocate_t)dlsym(dnssd->module, "TXTRecordDeallocate"); | |
183 | ||
184 | if (!dnssd->DNSServiceRegister || !dnssd->DNSServiceRefDeallocate || !dnssd->TXTRecordCreate || | |
185 | !dnssd->TXTRecordSetValue || !dnssd->TXTRecordGetLength || !dnssd->TXTRecordGetBytesPtr || | |
186 | !dnssd->TXTRecordDeallocate) { | |
187 | if (error) *error = DNSSD_ERROR_PROCNOTFOUND; | |
188 | dlclose(dnssd->module); | |
189 | free(dnssd); | |
190 | return NULL; | |
191 | } | |
2340bcd3 JVH |
192 | #else |
193 | dnssd->DNSServiceRegister = &DNSServiceRegister; | |
194 | dnssd->DNSServiceRefDeallocate = &DNSServiceRefDeallocate; | |
195 | dnssd->TXTRecordCreate = &TXTRecordCreate; | |
196 | dnssd->TXTRecordSetValue = &TXTRecordSetValue; | |
197 | dnssd->TXTRecordGetLength = &TXTRecordGetLength; | |
198 | dnssd->TXTRecordGetBytesPtr = &TXTRecordGetBytesPtr; | |
199 | dnssd->TXTRecordDeallocate = &TXTRecordDeallocate; | |
200 | #endif | |
201 | ||
2340bcd3 JVH |
202 | return dnssd; |
203 | } | |
204 | ||
205 | void | |
206 | dnssd_destroy(dnssd_t *dnssd) | |
207 | { | |
208 | if (dnssd) { | |
209 | #ifdef WIN32 | |
210 | FreeLibrary(dnssd->module); | |
6da21350 JVH |
211 | #elif USE_LIBDL |
212 | dlclose(dnssd->module); | |
2340bcd3 JVH |
213 | #endif |
214 | free(dnssd); | |
215 | } | |
216 | } | |
217 | ||
218 | int | |
e4169f77 | 219 | dnssd_register_raop(dnssd_t *dnssd, const char *name, unsigned short port, const char *hwaddr, int hwaddrlen, int password) |
2340bcd3 JVH |
220 | { |
221 | TXTRecordRef txtRecord; | |
222 | char servname[MAX_SERVNAME]; | |
223 | int ret; | |
224 | ||
225 | assert(dnssd); | |
067f00ef JVH |
226 | assert(name); |
227 | assert(hwaddr); | |
2340bcd3 JVH |
228 | |
229 | dnssd->TXTRecordCreate(&txtRecord, 0, NULL); | |
230 | dnssd->TXTRecordSetValue(&txtRecord, "txtvers", strlen(RAOP_TXTVERS), RAOP_TXTVERS); | |
231 | dnssd->TXTRecordSetValue(&txtRecord, "ch", strlen(RAOP_CH), RAOP_CH); | |
232 | dnssd->TXTRecordSetValue(&txtRecord, "cn", strlen(RAOP_CN), RAOP_CN); | |
233 | dnssd->TXTRecordSetValue(&txtRecord, "et", strlen(RAOP_ET), RAOP_ET); | |
234 | dnssd->TXTRecordSetValue(&txtRecord, "sv", strlen(RAOP_SV), RAOP_SV); | |
235 | dnssd->TXTRecordSetValue(&txtRecord, "da", strlen(RAOP_DA), RAOP_DA); | |
236 | dnssd->TXTRecordSetValue(&txtRecord, "sr", strlen(RAOP_SR), RAOP_SR); | |
237 | dnssd->TXTRecordSetValue(&txtRecord, "ss", strlen(RAOP_SS), RAOP_SS); | |
e4169f77 JVH |
238 | if (password) { |
239 | dnssd->TXTRecordSetValue(&txtRecord, "pw", strlen("true"), "true"); | |
240 | } else { | |
241 | dnssd->TXTRecordSetValue(&txtRecord, "pw", strlen("false"), "false"); | |
242 | } | |
2340bcd3 JVH |
243 | dnssd->TXTRecordSetValue(&txtRecord, "vn", strlen(RAOP_VN), RAOP_VN); |
244 | dnssd->TXTRecordSetValue(&txtRecord, "tp", strlen(RAOP_TP), RAOP_TP); | |
245 | dnssd->TXTRecordSetValue(&txtRecord, "md", strlen(RAOP_MD), RAOP_MD); | |
246 | dnssd->TXTRecordSetValue(&txtRecord, "vs", strlen(GLOBAL_VERSION), GLOBAL_VERSION); | |
e66980f2 JVH |
247 | dnssd->TXTRecordSetValue(&txtRecord, "sm", strlen(RAOP_SM), RAOP_SM); |
248 | dnssd->TXTRecordSetValue(&txtRecord, "ek", strlen(RAOP_EK), RAOP_EK); | |
2340bcd3 JVH |
249 | |
250 | /* Convert hardware address to string */ | |
067f00ef | 251 | ret = utils_hwaddr_raop(servname, sizeof(servname), hwaddr, hwaddrlen); |
2340bcd3 JVH |
252 | if (ret < 0) { |
253 | /* FIXME: handle better */ | |
254 | return -1; | |
255 | } | |
256 | ||
257 | /* Check that we have bytes for 'hw@name' format */ | |
258 | if (sizeof(servname) < strlen(servname)+1+strlen(name)+1) { | |
259 | /* FIXME: handle better */ | |
260 | return -2; | |
261 | } | |
262 | ||
263 | strncat(servname, "@", sizeof(servname)-strlen(servname)-1); | |
264 | strncat(servname, name, sizeof(servname)-strlen(servname)-1); | |
265 | ||
266 | /* Register the service */ | |
267 | dnssd->DNSServiceRegister(&dnssd->raopService, 0, 0, | |
268 | servname, "_raop._tcp", | |
269 | NULL, NULL, | |
270 | htons(port), | |
271 | dnssd->TXTRecordGetLength(&txtRecord), | |
272 | dnssd->TXTRecordGetBytesPtr(&txtRecord), | |
273 | NULL, NULL); | |
274 | ||
275 | /* Deallocate TXT record */ | |
276 | dnssd->TXTRecordDeallocate(&txtRecord); | |
277 | return 1; | |
278 | } | |
279 | ||
280 | int | |
067f00ef | 281 | dnssd_register_airplay(dnssd_t *dnssd, const char *name, unsigned short port, const char *hwaddr, int hwaddrlen) |
2340bcd3 JVH |
282 | { |
283 | TXTRecordRef txtRecord; | |
284 | char deviceid[3*MAX_HWADDR_LEN]; | |
285 | char features[16]; | |
286 | int ret; | |
287 | ||
288 | assert(dnssd); | |
067f00ef JVH |
289 | assert(name); |
290 | assert(hwaddr); | |
2340bcd3 JVH |
291 | |
292 | /* Convert hardware address to string */ | |
067f00ef | 293 | ret = utils_hwaddr_airplay(deviceid, sizeof(deviceid), hwaddr, hwaddrlen); |
2340bcd3 JVH |
294 | if (ret < 0) { |
295 | /* FIXME: handle better */ | |
296 | return -1; | |
297 | } | |
298 | ||
299 | features[sizeof(features)-1] = '\0'; | |
300 | snprintf(features, sizeof(features)-1, "0x%x", GLOBAL_FEATURES); | |
301 | ||
302 | dnssd->TXTRecordCreate(&txtRecord, 0, NULL); | |
303 | dnssd->TXTRecordSetValue(&txtRecord, "deviceid", strlen(deviceid), deviceid); | |
304 | dnssd->TXTRecordSetValue(&txtRecord, "features", strlen(features), features); | |
305 | dnssd->TXTRecordSetValue(&txtRecord, "model", strlen(GLOBAL_MODEL), GLOBAL_MODEL); | |
306 | ||
307 | /* Register the service */ | |
308 | dnssd->DNSServiceRegister(&dnssd->airplayService, 0, 0, | |
309 | name, "_airplay._tcp", | |
310 | NULL, NULL, | |
311 | htons(port), | |
312 | dnssd->TXTRecordGetLength(&txtRecord), | |
313 | dnssd->TXTRecordGetBytesPtr(&txtRecord), | |
314 | NULL, NULL); | |
315 | ||
316 | /* Deallocate TXT record */ | |
317 | dnssd->TXTRecordDeallocate(&txtRecord); | |
318 | return 0; | |
319 | } | |
320 | ||
321 | void | |
322 | dnssd_unregister_raop(dnssd_t *dnssd) | |
323 | { | |
324 | assert(dnssd); | |
325 | ||
326 | if (!dnssd->raopService) { | |
327 | return; | |
328 | } | |
329 | ||
330 | dnssd->DNSServiceRefDeallocate(dnssd->raopService); | |
331 | dnssd->raopService = NULL; | |
332 | } | |
333 | ||
334 | void | |
335 | dnssd_unregister_airplay(dnssd_t *dnssd) | |
336 | { | |
337 | assert(dnssd); | |
338 | ||
339 | if (!dnssd->airplayService) { | |
340 | return; | |
341 | } | |
342 | ||
343 | dnssd->DNSServiceRefDeallocate(dnssd->airplayService); | |
344 | dnssd->airplayService = NULL; | |
345 | } |