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