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