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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 <stdio.h> | |
17 | #include <string.h> | |
18 | #include <assert.h> | |
19 | ||
20 | #include "raop.h" | |
21 | #include "raop_rtp.h" | |
22 | #include "rsakey.h" | |
e4169f77 | 23 | #include "digest.h" |
2340bcd3 JVH |
24 | #include "httpd.h" |
25 | #include "sdp.h" | |
26 | ||
27 | #include "global.h" | |
28 | #include "utils.h" | |
29 | #include "netutils.h" | |
30 | #include "logger.h" | |
566c9bf8 | 31 | #include "compat.h" |
2340bcd3 JVH |
32 | |
33 | /* Actually 345 bytes for 2048-bit key */ | |
34 | #define MAX_SIGNATURE_LEN 512 | |
35 | ||
e4169f77 JVH |
36 | /* Let's just decide on some length */ |
37 | #define MAX_PASSWORD_LEN 64 | |
38 | ||
39 | /* MD5 as hex fits here */ | |
268f72c8 | 40 | #define MAX_NONCE_LEN 32 |
e4169f77 | 41 | |
2340bcd3 JVH |
42 | struct raop_s { |
43 | /* Callbacks for audio */ | |
44 | raop_callbacks_t callbacks; | |
45 | ||
46 | /* Logger instance */ | |
47 | logger_t logger; | |
48 | ||
49 | /* HTTP daemon and RSA key */ | |
50 | httpd_t *httpd; | |
51 | rsakey_t *rsakey; | |
52 | ||
53 | /* Hardware address information */ | |
54 | unsigned char hwaddr[MAX_HWADDR_LEN]; | |
55 | int hwaddrlen; | |
e4169f77 JVH |
56 | |
57 | /* Password information */ | |
58 | char password[MAX_PASSWORD_LEN+1]; | |
2340bcd3 JVH |
59 | }; |
60 | ||
61 | struct raop_conn_s { | |
62 | raop_t *raop; | |
63 | raop_rtp_t *raop_rtp; | |
64 | ||
65 | unsigned char *local; | |
66 | int locallen; | |
67 | ||
68 | unsigned char *remote; | |
69 | int remotelen; | |
e4169f77 JVH |
70 | |
71 | char nonce[MAX_NONCE_LEN+1]; | |
2340bcd3 JVH |
72 | }; |
73 | typedef struct raop_conn_s raop_conn_t; | |
74 | ||
75 | static void * | |
76 | conn_init(void *opaque, unsigned char *local, int locallen, unsigned char *remote, int remotelen) | |
77 | { | |
78 | raop_conn_t *conn; | |
2340bcd3 JVH |
79 | |
80 | conn = calloc(1, sizeof(raop_conn_t)); | |
81 | if (!conn) { | |
82 | return NULL; | |
83 | } | |
84 | conn->raop = opaque; | |
85 | conn->raop_rtp = NULL; | |
86 | ||
c891f978 JVH |
87 | if (locallen == 4) { |
88 | logger_log(&conn->raop->logger, LOGGER_INFO, | |
46212791 | 89 | "Local: %d.%d.%d.%d", |
c891f978 JVH |
90 | local[0], local[1], local[2], local[3]); |
91 | } else if (locallen == 16) { | |
92 | logger_log(&conn->raop->logger, LOGGER_INFO, | |
46212791 | 93 | "Local: %02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x", |
c891f978 JVH |
94 | local[0], local[1], local[2], local[3], local[4], local[5], local[6], local[7], |
95 | local[8], local[9], local[10], local[11], local[12], local[13], local[14], local[15]); | |
2340bcd3 | 96 | } |
c891f978 JVH |
97 | if (remotelen == 4) { |
98 | logger_log(&conn->raop->logger, LOGGER_INFO, | |
46212791 | 99 | "Remote: %d.%d.%d.%d", |
c891f978 JVH |
100 | remote[0], remote[1], remote[2], remote[3]); |
101 | } else if (remotelen == 16) { | |
102 | logger_log(&conn->raop->logger, LOGGER_INFO, | |
46212791 | 103 | "Remote: %02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x", |
c891f978 JVH |
104 | remote[0], remote[1], remote[2], remote[3], remote[4], remote[5], remote[6], remote[7], |
105 | remote[8], remote[9], remote[10], remote[11], remote[12], remote[13], remote[14], remote[15]); | |
2340bcd3 | 106 | } |
2340bcd3 JVH |
107 | |
108 | conn->local = malloc(locallen); | |
109 | assert(conn->local); | |
110 | memcpy(conn->local, local, locallen); | |
111 | ||
112 | conn->remote = malloc(remotelen); | |
113 | assert(conn->remote); | |
114 | memcpy(conn->remote, remote, remotelen); | |
115 | ||
116 | conn->locallen = locallen; | |
117 | conn->remotelen = remotelen; | |
e4169f77 JVH |
118 | |
119 | digest_generate_nonce(conn->nonce, sizeof(conn->nonce)); | |
2340bcd3 JVH |
120 | return conn; |
121 | } | |
122 | ||
123 | static void | |
124 | conn_request(void *ptr, http_request_t *request, http_response_t **response) | |
125 | { | |
126 | raop_conn_t *conn = ptr; | |
127 | raop_t *raop = conn->raop; | |
128 | ||
129 | http_response_t *res; | |
130 | const char *method; | |
131 | const char *cseq; | |
132 | const char *challenge; | |
e4169f77 | 133 | int require_auth = 0; |
2340bcd3 JVH |
134 | |
135 | method = http_request_get_method(request); | |
136 | cseq = http_request_get_header(request, "CSeq"); | |
137 | if (!method || !cseq) { | |
138 | return; | |
139 | } | |
140 | ||
141 | res = http_response_init("RTSP/1.0", 200, "OK"); | |
e4169f77 JVH |
142 | if (strlen(raop->password)) { |
143 | const char *authorization; | |
144 | ||
145 | authorization = http_request_get_header(request, "Authorization"); | |
146 | if (authorization) { | |
46212791 JVH |
147 | logger_log(&conn->raop->logger, LOGGER_DEBUG, "Our nonce: %s", conn->nonce); |
148 | logger_log(&conn->raop->logger, LOGGER_DEBUG, "Authorization: %s", authorization); | |
e4169f77 | 149 | } |
268f72c8 | 150 | if (!digest_is_valid("AppleTV", raop->password, conn->nonce, method, http_request_get_url(request), authorization)) { |
e4169f77 JVH |
151 | char *authstr; |
152 | int authstrlen; | |
153 | ||
154 | /* Allocate the authenticate string */ | |
155 | authstrlen = sizeof("Digest realm=\"AppleTV\", nonce=\"\"") + sizeof(conn->nonce) + 1; | |
156 | authstr = malloc(authstrlen); | |
157 | ||
158 | /* Concatenate the authenticate string */ | |
159 | memset(authstr, 0, authstrlen); | |
160 | strcat(authstr, "Digest realm=\"AppleTV\", nonce=\""); | |
161 | strcat(authstr, conn->nonce); | |
162 | strcat(authstr, "\""); | |
163 | ||
164 | /* Construct a new response */ | |
165 | require_auth = 1; | |
166 | http_response_destroy(res); | |
167 | res = http_response_init("RTSP/1.0", 401, "Unauthorized"); | |
168 | http_response_add_header(res, "WWW-Authenticate", authstr); | |
169 | free(authstr); | |
170 | } else { | |
46212791 | 171 | logger_log(&conn->raop->logger, LOGGER_DEBUG, "AUTHENTICATION SUCCESS!"); |
e4169f77 JVH |
172 | } |
173 | } | |
174 | ||
2340bcd3 JVH |
175 | http_response_add_header(res, "CSeq", cseq); |
176 | http_response_add_header(res, "Apple-Jack-Status", "connected; type=analog"); | |
177 | ||
178 | challenge = http_request_get_header(request, "Apple-Challenge"); | |
91c41e1d | 179 | if (!require_auth && challenge) { |
2340bcd3 JVH |
180 | char signature[MAX_SIGNATURE_LEN]; |
181 | ||
182 | memset(signature, 0, sizeof(signature)); | |
183 | rsakey_sign(raop->rsakey, signature, sizeof(signature), challenge, | |
184 | conn->local, conn->locallen, raop->hwaddr, raop->hwaddrlen); | |
2340bcd3 | 185 | http_response_add_header(res, "Apple-Response", signature); |
c891f978 | 186 | |
46212791 JVH |
187 | logger_log(&conn->raop->logger, LOGGER_DEBUG, "Got challenge: %s", challenge); |
188 | logger_log(&conn->raop->logger, LOGGER_DEBUG, "Got response: %s", signature); | |
2340bcd3 | 189 | } |
e4169f77 JVH |
190 | |
191 | if (require_auth) { | |
192 | /* Do nothing in case of authentication request */ | |
193 | } else if (!strcmp(method, "OPTIONS")) { | |
2340bcd3 JVH |
194 | http_response_add_header(res, "Public", "ANNOUNCE, SETUP, RECORD, PAUSE, FLUSH, TEARDOWN, OPTIONS, GET_PARAMETER, SET_PARAMETER"); |
195 | } else if (!strcmp(method, "ANNOUNCE")) { | |
196 | const char *data; | |
197 | int datalen; | |
198 | ||
199 | unsigned char aeskey[16]; | |
200 | unsigned char aesiv[16]; | |
201 | int aeskeylen, aesivlen; | |
202 | ||
203 | data = http_request_get_data(request, &datalen); | |
204 | if (data) { | |
ba0970e1 JVH |
205 | sdp_t *sdp; |
206 | const char *remotestr, *fmtpstr, *aeskeystr, *aesivstr; | |
207 | ||
208 | sdp = sdp_init(data, datalen); | |
209 | remotestr = sdp_get_connection(sdp); | |
210 | fmtpstr = sdp_get_fmtp(sdp); | |
211 | aeskeystr = sdp_get_rsaaeskey(sdp); | |
212 | aesivstr = sdp_get_aesiv(sdp); | |
213 | ||
46212791 JVH |
214 | logger_log(&conn->raop->logger, LOGGER_DEBUG, "connection: %s", remotestr); |
215 | logger_log(&conn->raop->logger, LOGGER_DEBUG, "fmtp: %s", fmtpstr); | |
216 | logger_log(&conn->raop->logger, LOGGER_DEBUG, "rsaaeskey: %s", aeskeystr); | |
217 | logger_log(&conn->raop->logger, LOGGER_DEBUG, "aesiv: %s", aesivstr); | |
ba0970e1 JVH |
218 | |
219 | aeskeylen = rsakey_decrypt(raop->rsakey, aeskey, sizeof(aeskey), aeskeystr); | |
220 | aesivlen = rsakey_parseiv(raop->rsakey, aesiv, sizeof(aesiv), aesivstr); | |
46212791 JVH |
221 | logger_log(&conn->raop->logger, LOGGER_DEBUG, "aeskeylen: %d", aeskeylen); |
222 | logger_log(&conn->raop->logger, LOGGER_DEBUG, "aesivlen: %d", aesivlen); | |
2340bcd3 | 223 | |
c891f978 JVH |
224 | if (conn->raop_rtp) { |
225 | /* This should never happen */ | |
226 | raop_rtp_destroy(conn->raop_rtp); | |
227 | conn->raop_rtp = NULL; | |
228 | } | |
ba0970e1 | 229 | conn->raop_rtp = raop_rtp_init(&raop->logger, &raop->callbacks, remotestr, fmtpstr, aeskey, aesiv); |
2340bcd3 JVH |
230 | sdp_destroy(sdp); |
231 | } | |
232 | } else if (!strcmp(method, "SETUP")) { | |
ba0970e1 | 233 | unsigned short remote_cport=0, remote_tport=0; |
2340bcd3 JVH |
234 | unsigned short cport=0, tport=0, dport=0; |
235 | const char *transport; | |
236 | char buffer[1024]; | |
237 | int use_udp; | |
238 | ||
239 | transport = http_request_get_header(request, "Transport"); | |
240 | assert(transport); | |
241 | ||
46212791 | 242 | logger_log(&conn->raop->logger, LOGGER_INFO, "Transport: %s", transport); |
2340bcd3 | 243 | use_udp = strncmp(transport, "RTP/AVP/TCP", 11); |
ba0970e1 JVH |
244 | if (use_udp) { |
245 | char *original, *current, *tmpstr; | |
246 | ||
247 | current = original = strdup(transport); | |
248 | if (original) { | |
249 | while ((tmpstr = utils_strsep(¤t, ";")) != NULL) { | |
250 | unsigned short value; | |
251 | int ret; | |
252 | ||
253 | ret = sscanf(tmpstr, "control_port=%hu", &value); | |
254 | if (ret == 1) { | |
46212791 | 255 | logger_log(&conn->raop->logger, LOGGER_DEBUG, "Found remote control port: %hu", value); |
ba0970e1 JVH |
256 | remote_cport = value; |
257 | } | |
258 | ret = sscanf(tmpstr, "timing_port=%hu", &value); | |
259 | if (ret == 1) { | |
46212791 | 260 | logger_log(&conn->raop->logger, LOGGER_DEBUG, "Found remote timing port: %hu", value); |
ba0970e1 JVH |
261 | remote_tport = value; |
262 | } | |
263 | } | |
264 | } | |
265 | free(original); | |
266 | } | |
267 | raop_rtp_start(conn->raop_rtp, use_udp, remote_cport, remote_tport, &cport, &tport, &dport); | |
2340bcd3 JVH |
268 | |
269 | memset(buffer, 0, sizeof(buffer)); | |
270 | if (use_udp) { | |
271 | snprintf(buffer, sizeof(buffer)-1, | |
ba0970e1 | 272 | "RTP/AVP/UDP;unicast;mode=record;timing_port=%hu;events;control_port=%hu;server_port=%hu", |
2340bcd3 JVH |
273 | tport, cport, dport); |
274 | } else { | |
275 | snprintf(buffer, sizeof(buffer)-1, | |
276 | "RTP/AVP/TCP;unicast;interleaved=0-1;mode=record;server_port=%u", | |
277 | dport); | |
278 | } | |
46212791 | 279 | logger_log(&conn->raop->logger, LOGGER_INFO, "Responding with %s", buffer); |
2340bcd3 JVH |
280 | http_response_add_header(res, "Transport", buffer); |
281 | http_response_add_header(res, "Session", "DEADBEEF"); | |
282 | } else if (!strcmp(method, "SET_PARAMETER")) { | |
036dec08 | 283 | const char *content_type; |
2340bcd3 JVH |
284 | const char *data; |
285 | int datalen; | |
2340bcd3 | 286 | |
036dec08 | 287 | content_type = http_request_get_header(request, "Content-Type"); |
2340bcd3 | 288 | data = http_request_get_data(request, &datalen); |
036dec08 JVH |
289 | if (!strcmp(content_type, "text/parameters")) { |
290 | char *datastr; | |
291 | datastr = calloc(1, datalen+1); | |
292 | if (data && datastr && conn->raop_rtp) { | |
293 | memcpy(datastr, data, datalen); | |
294 | if (!strncmp(datastr, "volume: ", 8)) { | |
295 | float vol = 0.0; | |
296 | sscanf(datastr+8, "%f", &vol); | |
297 | raop_rtp_set_volume(conn->raop_rtp, vol); | |
298 | } | |
2340bcd3 | 299 | } |
036dec08 JVH |
300 | free(datastr); |
301 | } else if (!strcmp(content_type, "image/jpeg")) { | |
3baaba9d JVH |
302 | logger_log(&conn->raop->logger, LOGGER_INFO, "Got image data of %d bytes", datalen); |
303 | raop_rtp_set_coverart(conn->raop_rtp, data, datalen); | |
036dec08 | 304 | } else if (!strcmp(content_type, "application/x-dmap-tagged")) { |
3baaba9d JVH |
305 | logger_log(&conn->raop->logger, LOGGER_INFO, "Got metadata of %d bytes", datalen); |
306 | raop_rtp_set_metadata(conn->raop_rtp, data, datalen); | |
2340bcd3 JVH |
307 | } |
308 | } else if (!strcmp(method, "FLUSH")) { | |
309 | const char *rtpinfo; | |
310 | int next_seq = -1; | |
311 | ||
312 | rtpinfo = http_request_get_header(request, "RTP-Info"); | |
c891f978 | 313 | if (rtpinfo) { |
46212791 | 314 | logger_log(&conn->raop->logger, LOGGER_INFO, "Flush with RTP-Info: %s", rtpinfo); |
c891f978 JVH |
315 | if (!strncmp(rtpinfo, "seq=", 4)) { |
316 | next_seq = strtol(rtpinfo+4, NULL, 10); | |
317 | } | |
318 | } | |
319 | if (conn->raop_rtp) { | |
320 | raop_rtp_flush(conn->raop_rtp, next_seq); | |
2340bcd3 | 321 | } |
2340bcd3 JVH |
322 | } else if (!strcmp(method, "TEARDOWN")) { |
323 | http_response_add_header(res, "Connection", "close"); | |
c891f978 JVH |
324 | if (conn->raop_rtp) { |
325 | /* Destroy our RTP session */ | |
326 | raop_rtp_stop(conn->raop_rtp); | |
327 | raop_rtp_destroy(conn->raop_rtp); | |
328 | conn->raop_rtp = NULL; | |
329 | } | |
2340bcd3 JVH |
330 | } |
331 | http_response_finish(res, NULL, 0); | |
332 | ||
46212791 | 333 | logger_log(&conn->raop->logger, LOGGER_DEBUG, "Got request %s with URL %s", method, http_request_get_url(request)); |
2340bcd3 JVH |
334 | *response = res; |
335 | } | |
336 | ||
337 | static void | |
338 | conn_destroy(void *ptr) | |
339 | { | |
340 | raop_conn_t *conn = ptr; | |
341 | ||
342 | if (conn->raop_rtp) { | |
c891f978 | 343 | /* This is done in case TEARDOWN was not called */ |
2340bcd3 JVH |
344 | raop_rtp_destroy(conn->raop_rtp); |
345 | } | |
346 | free(conn->local); | |
347 | free(conn->remote); | |
348 | free(conn); | |
349 | } | |
350 | ||
351 | raop_t * | |
406e9777 | 352 | raop_init(raop_callbacks_t *callbacks, const char *pemkey) |
2340bcd3 JVH |
353 | { |
354 | raop_t *raop; | |
355 | httpd_t *httpd; | |
356 | rsakey_t *rsakey; | |
357 | httpd_callbacks_t httpd_cbs; | |
358 | ||
359 | assert(callbacks); | |
360 | assert(pemkey); | |
2340bcd3 JVH |
361 | |
362 | /* Initialize the network */ | |
363 | if (netutils_init() < 0) { | |
364 | return NULL; | |
365 | } | |
366 | ||
367 | /* Validate the callbacks structure */ | |
b4cc5b07 JVH |
368 | if (!callbacks->audio_init || |
369 | !callbacks->audio_process || | |
2340bcd3 JVH |
370 | !callbacks->audio_destroy) { |
371 | return NULL; | |
372 | } | |
373 | ||
2340bcd3 JVH |
374 | /* Allocate the raop_t structure */ |
375 | raop = calloc(1, sizeof(raop_t)); | |
376 | if (!raop) { | |
377 | return NULL; | |
378 | } | |
379 | ||
380 | /* Initialize the logger */ | |
381 | logger_init(&raop->logger); | |
382 | ||
383 | /* Set HTTP callbacks to our handlers */ | |
384 | memset(&httpd_cbs, 0, sizeof(httpd_cbs)); | |
385 | httpd_cbs.opaque = raop; | |
386 | httpd_cbs.conn_init = &conn_init; | |
387 | httpd_cbs.conn_request = &conn_request; | |
388 | httpd_cbs.conn_destroy = &conn_destroy; | |
389 | ||
390 | /* Initialize the http daemon */ | |
391 | httpd = httpd_init(&raop->logger, &httpd_cbs, 10, 1); | |
392 | if (!httpd) { | |
393 | free(raop); | |
394 | return NULL; | |
395 | } | |
396 | ||
397 | /* Copy callbacks structure */ | |
398 | memcpy(&raop->callbacks, callbacks, sizeof(raop_callbacks_t)); | |
399 | ||
400 | /* Initialize RSA key handler */ | |
401 | rsakey = rsakey_init_pem(pemkey); | |
402 | if (!rsakey) { | |
403 | free(httpd); | |
404 | free(raop); | |
405 | return NULL; | |
406 | } | |
407 | ||
408 | raop->httpd = httpd; | |
409 | raop->rsakey = rsakey; | |
410 | ||
2340bcd3 JVH |
411 | return raop; |
412 | } | |
413 | ||
414 | raop_t * | |
406e9777 | 415 | raop_init_from_keyfile(raop_callbacks_t *callbacks, const char *keyfile) |
2340bcd3 JVH |
416 | { |
417 | raop_t *raop; | |
418 | char *pemstr; | |
419 | ||
420 | if (utils_read_file(&pemstr, keyfile) < 0) { | |
421 | return NULL; | |
422 | } | |
406e9777 | 423 | raop = raop_init(callbacks, pemstr); |
2340bcd3 JVH |
424 | free(pemstr); |
425 | return raop; | |
426 | } | |
427 | ||
428 | void | |
429 | raop_destroy(raop_t *raop) | |
430 | { | |
431 | if (raop) { | |
432 | raop_stop(raop); | |
433 | ||
434 | httpd_destroy(raop->httpd); | |
435 | rsakey_destroy(raop->rsakey); | |
436 | free(raop); | |
437 | ||
438 | /* Cleanup the network */ | |
439 | netutils_cleanup(); | |
440 | } | |
441 | } | |
442 | ||
5a746b97 JVH |
443 | int |
444 | raop_is_running(raop_t *raop) | |
445 | { | |
446 | assert(raop); | |
447 | ||
448 | return httpd_is_running(raop->httpd); | |
449 | } | |
450 | ||
2340bcd3 | 451 | int |
e4169f77 | 452 | raop_start(raop_t *raop, unsigned short *port, const char *hwaddr, int hwaddrlen, const char *password) |
2340bcd3 JVH |
453 | { |
454 | assert(raop); | |
455 | assert(port); | |
406e9777 JVH |
456 | assert(hwaddr); |
457 | ||
458 | /* Validate hardware address */ | |
459 | if (hwaddrlen > MAX_HWADDR_LEN) { | |
460 | return -1; | |
461 | } | |
462 | ||
a68fedbb JVH |
463 | memset(raop->password, 0, sizeof(raop->password)); |
464 | if (password) { | |
465 | /* Validate password */ | |
466 | if (strlen(password) > MAX_PASSWORD_LEN) { | |
467 | return -1; | |
468 | } | |
469 | ||
470 | /* Copy password to the raop structure */ | |
471 | strncpy(raop->password, password, MAX_PASSWORD_LEN); | |
e4169f77 JVH |
472 | } |
473 | ||
406e9777 JVH |
474 | /* Copy hwaddr to the raop structure */ |
475 | memcpy(raop->hwaddr, hwaddr, hwaddrlen); | |
476 | raop->hwaddrlen = hwaddrlen; | |
2340bcd3 JVH |
477 | |
478 | return httpd_start(raop->httpd, port); | |
479 | } | |
480 | ||
481 | void | |
482 | raop_stop(raop_t *raop) | |
483 | { | |
484 | assert(raop); | |
485 | ||
486 | httpd_stop(raop->httpd); | |
487 | } | |
488 |