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2340bcd3 JVH |
1 | #include <stdlib.h> |
2 | #include <string.h> | |
3 | #include <stdio.h> | |
4 | #include <assert.h> | |
5 | ||
6 | #include "dnssd.h" | |
7 | #include "dnssdint.h" | |
8 | #include "global.h" | |
9 | #include "compat.h" | |
10 | #include "utils.h" | |
11 | ||
12 | #define MAX_DEVICEID 18 | |
13 | #define MAX_SERVNAME 256 | |
14 | ||
15 | #ifndef WIN32 | |
16 | # include <dns_sd.h> | |
17 | #else | |
18 | # include <stdint.h> | |
19 | # if !defined(EFI32) && !defined(EFI64) | |
20 | # define DNSSD_API __stdcall | |
21 | # else | |
22 | # define DNSSD_API | |
23 | # endif | |
24 | ||
25 | typedef struct _DNSServiceRef_t *DNSServiceRef; | |
26 | typedef union _TXTRecordRef_t { char PrivateData[16]; char *ForceNaturalAlignment; } TXTRecordRef; | |
27 | ||
28 | typedef uint32_t DNSServiceFlags; | |
29 | typedef int32_t DNSServiceErrorType; | |
30 | ||
31 | typedef void (DNSSD_API *DNSServiceRegisterReply) | |
32 | ( | |
33 | DNSServiceRef sdRef, | |
34 | DNSServiceFlags flags, | |
35 | DNSServiceErrorType errorCode, | |
36 | const char *name, | |
37 | const char *regtype, | |
38 | const char *domain, | |
39 | void *context | |
40 | ); | |
41 | #endif | |
42 | ||
43 | typedef DNSServiceErrorType (DNSSD_API *DNSServiceRegister_t) | |
44 | ( | |
45 | DNSServiceRef *sdRef, | |
46 | DNSServiceFlags flags, | |
47 | uint32_t interfaceIndex, | |
48 | const char *name, | |
49 | const char *regtype, | |
50 | const char *domain, | |
51 | const char *host, | |
52 | uint16_t port, | |
53 | uint16_t txtLen, | |
54 | const void *txtRecord, | |
55 | DNSServiceRegisterReply callBack, | |
56 | void *context | |
57 | ); | |
58 | typedef void (DNSSD_API *DNSServiceRefDeallocate_t)(DNSServiceRef sdRef); | |
59 | typedef void (DNSSD_API *TXTRecordCreate_t) | |
60 | ( | |
61 | TXTRecordRef *txtRecord, | |
62 | uint16_t bufferLen, | |
63 | void *buffer | |
64 | ); | |
65 | typedef void (DNSSD_API *TXTRecordDeallocate_t)(TXTRecordRef *txtRecord); | |
66 | typedef DNSServiceErrorType (DNSSD_API *TXTRecordSetValue_t) | |
67 | ( | |
68 | TXTRecordRef *txtRecord, | |
69 | const char *key, | |
70 | uint8_t valueSize, | |
71 | const void *value | |
72 | ); | |
73 | typedef uint16_t (DNSSD_API *TXTRecordGetLength_t)(const TXTRecordRef *txtRecord); | |
74 | typedef const void * (DNSSD_API *TXTRecordGetBytesPtr_t)(const TXTRecordRef *txtRecord); | |
75 | ||
76 | ||
77 | struct dnssd_s { | |
78 | #ifdef WIN32 | |
79 | HMODULE module; | |
80 | #endif | |
81 | ||
82 | DNSServiceRegister_t DNSServiceRegister; | |
83 | DNSServiceRefDeallocate_t DNSServiceRefDeallocate; | |
84 | TXTRecordCreate_t TXTRecordCreate; | |
85 | TXTRecordSetValue_t TXTRecordSetValue; | |
86 | TXTRecordGetLength_t TXTRecordGetLength; | |
87 | TXTRecordGetBytesPtr_t TXTRecordGetBytesPtr; | |
88 | TXTRecordDeallocate_t TXTRecordDeallocate; | |
89 | ||
90 | char hwaddr[MAX_HWADDR_LEN]; | |
91 | int hwaddrlen; | |
92 | ||
93 | DNSServiceRef raopService; | |
94 | DNSServiceRef airplayService; | |
95 | }; | |
96 | ||
97 | ||
98 | ||
99 | dnssd_t * | |
100 | dnssd_init(const char *hwaddr, int hwaddrlen, int *error) | |
101 | { | |
102 | dnssd_t *dnssd; | |
103 | ||
104 | if (error) *error = DNSSD_ERROR_NOERROR; | |
105 | if (hwaddrlen > MAX_HWADDR_LEN) { | |
106 | if (error) *error = DNSSD_ERROR_HWADDRLEN; | |
107 | return NULL; | |
108 | } | |
109 | ||
110 | dnssd = calloc(1, sizeof(dnssd_t)); | |
111 | if (!dnssd) { | |
112 | if (error) *error = DNSSD_ERROR_OUTOFMEM; | |
113 | return NULL; | |
114 | } | |
115 | ||
116 | #ifdef WIN32 | |
117 | dnssd->module = LoadLibraryA("dnssd.dll"); | |
118 | if (!dnssd->module) { | |
119 | if (error) *error = DNSSD_ERROR_LIBNOTFOUND; | |
120 | free(dnssd); | |
121 | return NULL; | |
122 | } | |
123 | dnssd->DNSServiceRegister = (DNSServiceRegister_t)GetProcAddress(dnssd->module, "DNSServiceRegister"); | |
124 | dnssd->DNSServiceRefDeallocate = (DNSServiceRefDeallocate_t)GetProcAddress(dnssd->module, "DNSServiceRefDeallocate"); | |
125 | dnssd->TXTRecordCreate = (TXTRecordCreate_t)GetProcAddress(dnssd->module, "TXTRecordCreate"); | |
126 | dnssd->TXTRecordSetValue = (TXTRecordSetValue_t)GetProcAddress(dnssd->module, "TXTRecordSetValue"); | |
127 | dnssd->TXTRecordGetLength = (TXTRecordGetLength_t)GetProcAddress(dnssd->module, "TXTRecordGetLength"); | |
128 | dnssd->TXTRecordGetBytesPtr = (TXTRecordGetBytesPtr_t)GetProcAddress(dnssd->module, "TXTRecordGetBytesPtr"); | |
129 | dnssd->TXTRecordDeallocate = (TXTRecordDeallocate_t)GetProcAddress(dnssd->module, "TXTRecordDeallocate"); | |
130 | ||
131 | if (!dnssd->DNSServiceRegister || !dnssd->DNSServiceRefDeallocate || !dnssd->TXTRecordCreate || | |
132 | !dnssd->TXTRecordSetValue || !dnssd->TXTRecordGetLength || !dnssd->TXTRecordGetBytesPtr || | |
133 | !dnssd->TXTRecordDeallocate) { | |
134 | if (error) *error = DNSSD_ERROR_PROCNOTFOUND; | |
135 | FreeLibrary(dnssd->module); | |
136 | free(dnssd); | |
137 | return NULL; | |
138 | } | |
139 | #else | |
140 | dnssd->DNSServiceRegister = &DNSServiceRegister; | |
141 | dnssd->DNSServiceRefDeallocate = &DNSServiceRefDeallocate; | |
142 | dnssd->TXTRecordCreate = &TXTRecordCreate; | |
143 | dnssd->TXTRecordSetValue = &TXTRecordSetValue; | |
144 | dnssd->TXTRecordGetLength = &TXTRecordGetLength; | |
145 | dnssd->TXTRecordGetBytesPtr = &TXTRecordGetBytesPtr; | |
146 | dnssd->TXTRecordDeallocate = &TXTRecordDeallocate; | |
147 | #endif | |
148 | ||
149 | memcpy(dnssd->hwaddr, hwaddr, hwaddrlen); | |
150 | dnssd->hwaddrlen = hwaddrlen; | |
151 | ||
152 | return dnssd; | |
153 | } | |
154 | ||
155 | void | |
156 | dnssd_destroy(dnssd_t *dnssd) | |
157 | { | |
158 | if (dnssd) { | |
159 | #ifdef WIN32 | |
160 | FreeLibrary(dnssd->module); | |
161 | #endif | |
162 | free(dnssd); | |
163 | } | |
164 | } | |
165 | ||
166 | int | |
167 | dnssd_register_raop(dnssd_t *dnssd, const char *name, unsigned short port) | |
168 | { | |
169 | TXTRecordRef txtRecord; | |
170 | char servname[MAX_SERVNAME]; | |
171 | int ret; | |
172 | ||
173 | assert(dnssd); | |
174 | ||
175 | dnssd->TXTRecordCreate(&txtRecord, 0, NULL); | |
176 | dnssd->TXTRecordSetValue(&txtRecord, "txtvers", strlen(RAOP_TXTVERS), RAOP_TXTVERS); | |
177 | dnssd->TXTRecordSetValue(&txtRecord, "ch", strlen(RAOP_CH), RAOP_CH); | |
178 | dnssd->TXTRecordSetValue(&txtRecord, "cn", strlen(RAOP_CN), RAOP_CN); | |
179 | dnssd->TXTRecordSetValue(&txtRecord, "et", strlen(RAOP_ET), RAOP_ET); | |
180 | dnssd->TXTRecordSetValue(&txtRecord, "sv", strlen(RAOP_SV), RAOP_SV); | |
181 | dnssd->TXTRecordSetValue(&txtRecord, "da", strlen(RAOP_DA), RAOP_DA); | |
182 | dnssd->TXTRecordSetValue(&txtRecord, "sr", strlen(RAOP_SR), RAOP_SR); | |
183 | dnssd->TXTRecordSetValue(&txtRecord, "ss", strlen(RAOP_SS), RAOP_SS); | |
184 | dnssd->TXTRecordSetValue(&txtRecord, "pw", strlen(RAOP_PW), RAOP_PW); | |
185 | dnssd->TXTRecordSetValue(&txtRecord, "vn", strlen(RAOP_VN), RAOP_VN); | |
186 | dnssd->TXTRecordSetValue(&txtRecord, "tp", strlen(RAOP_TP), RAOP_TP); | |
187 | dnssd->TXTRecordSetValue(&txtRecord, "md", strlen(RAOP_MD), RAOP_MD); | |
188 | dnssd->TXTRecordSetValue(&txtRecord, "vs", strlen(GLOBAL_VERSION), GLOBAL_VERSION); | |
189 | dnssd->TXTRecordSetValue(&txtRecord, "am", strlen(RAOP_AM), RAOP_AM); | |
190 | dnssd->TXTRecordSetValue(&txtRecord, "sf", strlen(RAOP_SF), RAOP_SF); | |
191 | ||
192 | /* Convert hardware address to string */ | |
193 | ret = utils_hwaddr_raop(servname, sizeof(servname), dnssd->hwaddr, dnssd->hwaddrlen); | |
194 | if (ret < 0) { | |
195 | /* FIXME: handle better */ | |
196 | return -1; | |
197 | } | |
198 | ||
199 | /* Check that we have bytes for 'hw@name' format */ | |
200 | if (sizeof(servname) < strlen(servname)+1+strlen(name)+1) { | |
201 | /* FIXME: handle better */ | |
202 | return -2; | |
203 | } | |
204 | ||
205 | strncat(servname, "@", sizeof(servname)-strlen(servname)-1); | |
206 | strncat(servname, name, sizeof(servname)-strlen(servname)-1); | |
207 | ||
208 | /* Register the service */ | |
209 | dnssd->DNSServiceRegister(&dnssd->raopService, 0, 0, | |
210 | servname, "_raop._tcp", | |
211 | NULL, NULL, | |
212 | htons(port), | |
213 | dnssd->TXTRecordGetLength(&txtRecord), | |
214 | dnssd->TXTRecordGetBytesPtr(&txtRecord), | |
215 | NULL, NULL); | |
216 | ||
217 | /* Deallocate TXT record */ | |
218 | dnssd->TXTRecordDeallocate(&txtRecord); | |
219 | return 1; | |
220 | } | |
221 | ||
222 | int | |
223 | dnssd_register_airplay(dnssd_t *dnssd, const char *name, unsigned short port) | |
224 | { | |
225 | TXTRecordRef txtRecord; | |
226 | char deviceid[3*MAX_HWADDR_LEN]; | |
227 | char features[16]; | |
228 | int ret; | |
229 | ||
230 | assert(dnssd); | |
231 | ||
232 | /* Convert hardware address to string */ | |
233 | ret = utils_hwaddr_airplay(deviceid, sizeof(deviceid), dnssd->hwaddr, dnssd->hwaddrlen); | |
234 | if (ret < 0) { | |
235 | /* FIXME: handle better */ | |
236 | return -1; | |
237 | } | |
238 | ||
239 | features[sizeof(features)-1] = '\0'; | |
240 | snprintf(features, sizeof(features)-1, "0x%x", GLOBAL_FEATURES); | |
241 | ||
242 | dnssd->TXTRecordCreate(&txtRecord, 0, NULL); | |
243 | dnssd->TXTRecordSetValue(&txtRecord, "deviceid", strlen(deviceid), deviceid); | |
244 | dnssd->TXTRecordSetValue(&txtRecord, "features", strlen(features), features); | |
245 | dnssd->TXTRecordSetValue(&txtRecord, "model", strlen(GLOBAL_MODEL), GLOBAL_MODEL); | |
246 | ||
247 | /* Register the service */ | |
248 | dnssd->DNSServiceRegister(&dnssd->airplayService, 0, 0, | |
249 | name, "_airplay._tcp", | |
250 | NULL, NULL, | |
251 | htons(port), | |
252 | dnssd->TXTRecordGetLength(&txtRecord), | |
253 | dnssd->TXTRecordGetBytesPtr(&txtRecord), | |
254 | NULL, NULL); | |
255 | ||
256 | /* Deallocate TXT record */ | |
257 | dnssd->TXTRecordDeallocate(&txtRecord); | |
258 | return 0; | |
259 | } | |
260 | ||
261 | void | |
262 | dnssd_unregister_raop(dnssd_t *dnssd) | |
263 | { | |
264 | assert(dnssd); | |
265 | ||
266 | if (!dnssd->raopService) { | |
267 | return; | |
268 | } | |
269 | ||
270 | dnssd->DNSServiceRefDeallocate(dnssd->raopService); | |
271 | dnssd->raopService = NULL; | |
272 | } | |
273 | ||
274 | void | |
275 | dnssd_unregister_airplay(dnssd_t *dnssd) | |
276 | { | |
277 | assert(dnssd); | |
278 | ||
279 | if (!dnssd->airplayService) { | |
280 | return; | |
281 | } | |
282 | ||
283 | dnssd->DNSServiceRefDeallocate(dnssd->airplayService); | |
284 | dnssd->airplayService = NULL; | |
285 | } |