1 /*****************************************************************************\
3 ** Linux Call Router **
5 **---------------------------------------------------------------------------**
6 ** Copyright: Andreas Eversberg **
8 ** mISDN channel handlin for remote application **
10 \*****************************************************************************/
18 #include <sys/ioctl.h>
19 #include <sys/types.h>
22 #include <netinet/udp.h>
23 #include <netinet/in.h>
25 #include <sys/socket.h>
28 #define AF_COMPATIBILITY_FUNC 1
29 #define MISDN_OLD_AF_COMPATIBILITY 1
30 #include <compat_af_isdn.h>
32 #include <asterisk/frame.h>
35 #include "extension.h"
37 #include "lcrsocket.h"
44 #ifndef ISDN_PID_L4_B_USER
45 #define ISDN_PID_L4_B_USER 0x440000ff
58 int bchannel_initialize(void)
65 void bchannel_deinitialize(void)
70 * send control information to the channel (dsp-module)
72 static void ph_control(int sock, unsigned int c1, unsigned int c2, char *trace_name, int trace_value, int b_mode)
74 unsigned char buffer[MISDN_HEADER_LEN+sizeof(int)+sizeof(int)];
75 struct mISDNhead *ctrl = (struct mISDNhead *)buffer;
76 unsigned int *d = (unsigned int *)(buffer+MISDN_HEADER_LEN);
79 if (b_mode != 0 && b_mode != 2)
82 CDEBUG(NULL, NULL, "Sending PH_CONTROL %s %x,%x\n", trace_name, c1, c2);
83 ctrl->prim = PH_CONTROL_REQ;
87 ret = sendto(sock, buffer, MISDN_HEADER_LEN+sizeof(int)*2, 0, NULL, 0);
89 CERROR(NULL, NULL, "Failed to send to socket %d\n", sock);
92 static void ph_control_block(int sock, unsigned int c1, void *c2, int c2_len, char *trace_name, int trace_value, int b_mode)
94 unsigned char buffer[MISDN_HEADER_LEN+sizeof(int)+c2_len];
95 struct mISDNhead *ctrl = (struct mISDNhead *)buffer;
96 unsigned int *d = (unsigned int *)(buffer+MISDN_HEADER_LEN);
99 if (b_mode != 0 && b_mode != 2)
102 CDEBUG(NULL, NULL, "Sending PH_CONTROL (block) %s %x\n", trace_name, c1);
103 ctrl->prim = PH_CONTROL_REQ;
106 memcpy(d, c2, c2_len);
107 ret = sendto(sock, buffer, MISDN_HEADER_LEN+sizeof(int)+c2_len, 0, NULL, 0);
109 CERROR(NULL, NULL, "Failed to send to socket %d\n", sock);
116 int bchannel_create(struct bchannel *bchannel, int mode)
120 struct sockaddr_mISDN addr;
122 if (bchannel->b_sock > -1)
124 CERROR(bchannel->call, NULL, "Socket already created for handle 0x%x\n", bchannel->handle);
129 bchannel->b_mode = mode;
130 switch(bchannel->b_mode)
133 CDEBUG(bchannel->call, NULL, "Open DSP audio\n");
134 bchannel->b_sock = socket(PF_ISDN, SOCK_DGRAM, ISDN_P_B_L2DSP);
137 CDEBUG(bchannel->call, NULL, "Open audio\n");
138 bchannel->b_sock = socket(PF_ISDN, SOCK_DGRAM, ISDN_P_B_RAW);
141 CDEBUG(bchannel->call, NULL, "Open DSP HDLC\n");
142 bchannel->b_sock = socket(PF_ISDN, SOCK_DGRAM, ISDN_P_B_L2DSPHDLC);
145 CDEBUG(bchannel->call, NULL, "Open HDLC\n");
146 bchannel->b_sock = socket(PF_ISDN, SOCK_DGRAM, ISDN_P_B_HDLC);
149 if (bchannel->b_sock < 0)
151 CERROR(bchannel->call, NULL, "Failed to open bchannel-socket for handle 0x%x with mISDN-DSP layer. Did you load mISDNdsp.ko?\n", bchannel->handle);
155 /* set nonblocking io */
156 ret = ioctl(bchannel->b_sock, FIONBIO, &on);
159 CERROR(bchannel->call, NULL, "Failed to set bchannel-socket handle 0x%x into nonblocking IO\n", bchannel->handle);
160 close(bchannel->b_sock);
161 bchannel->b_sock = -1;
165 /* bind socket to bchannel */
166 addr.family = AF_ISDN;
167 addr.dev = (bchannel->handle>>8);
168 addr.channel = bchannel->handle & 0xff;
169 ret = bind(bchannel->b_sock, (struct sockaddr *)&addr, sizeof(addr));
172 CERROR(bchannel->call, NULL, "Failed to bind bchannel-socket for handle 0x%x with mISDN-DSP layer. (port %d, channel %d) Did you load mISDNdsp.ko?\n", bchannel->handle, addr.dev, addr.channel);
173 close(bchannel->b_sock);
174 bchannel->b_sock = -1;
182 * activate / deactivate request
184 void bchannel_activate(struct bchannel *bchannel, int activate)
186 struct mISDNhead act;
189 /* activate bchannel */
190 CDEBUG(bchannel->call, NULL, "%sActivating B-channel.\n", activate?"":"De-");
191 switch(bchannel->b_mode)
195 act.prim = (activate)?DL_ESTABLISH_REQ:DL_RELEASE_REQ;
199 act.prim = (activate)?PH_ACTIVATE_REQ:PH_DEACTIVATE_REQ;
203 ret = sendto(bchannel->b_sock, &act, MISDN_HEADER_LEN, 0, NULL, 0);
205 CERROR(bchannel->call, NULL, "Failed to send to socket %d\n", bchannel->b_sock);
207 bchannel->b_state = (activate)?BSTATE_ACTIVATING:BSTATE_DEACTIVATING;
208 bchannel->rebuffer_usage = 0;
215 static void bchannel_activated(struct bchannel *bchannel)
219 sock = bchannel->b_sock;
221 /* set dsp features */
222 if (bchannel->b_txdata)
223 ph_control(sock, (bchannel->b_txdata)?DSP_TXDATA_ON:DSP_TXDATA_OFF, 0, "DSP-TXDATA", bchannel->b_txdata, bchannel->b_mode);
224 if (bchannel->b_delay && bchannel->b_mode == 0)
225 ph_control(sock, DSP_DELAY, bchannel->b_delay, "DSP-DELAY", bchannel->b_delay, bchannel->b_mode);
226 if (bchannel->b_tx_dejitter && bchannel->b_mode == 0)
227 ph_control(sock, (bchannel->b_tx_dejitter)?DSP_TX_DEJITTER:DSP_TX_DEJ_OFF, 0, "DSP-TX_DEJITTER", bchannel->b_tx_dejitter, bchannel->b_mode);
228 if (bchannel->b_tx_gain && bchannel->b_mode == 0)
229 ph_control(sock, DSP_VOL_CHANGE_TX, bchannel->b_tx_gain, "DSP-TX_GAIN", bchannel->b_tx_gain, bchannel->b_mode);
230 if (bchannel->b_rx_gain && bchannel->b_mode == 0)
231 ph_control(sock, DSP_VOL_CHANGE_RX, bchannel->b_rx_gain, "DSP-RX_GAIN", bchannel->b_rx_gain, bchannel->b_mode);
232 if (bchannel->b_pipeline[0] && bchannel->b_mode == 0)
233 ph_control_block(sock, DSP_PIPELINE_CFG, bchannel->b_pipeline, strlen(bchannel->b_pipeline)+1, "DSP-PIPELINE", 0, bchannel->b_mode);
234 if (bchannel->b_conf)
235 ph_control(sock, DSP_CONF_JOIN, bchannel->b_conf, "DSP-CONF", bchannel->b_conf, bchannel->b_mode);
236 if (bchannel->b_echo)
237 ph_control(sock, DSP_ECHO_ON, 0, "DSP-ECHO", 1, bchannel->b_mode);
238 if (bchannel->b_tone && bchannel->b_mode == 0)
239 ph_control(sock, DSP_TONE_PATT_ON, bchannel->b_tone, "DSP-TONE", bchannel->b_tone, bchannel->b_mode);
240 if (bchannel->b_rxoff)
241 ph_control(sock, DSP_RECEIVE_OFF, 0, "DSP-RXOFF", 1, bchannel->b_mode);
242 // if (bchannel->b_txmix && bchannel->b_mode == 0)
243 // ph_control(sock, DSP_MIX_ON, 0, "DSP-MIX", 1, bchannel->b_mode);
244 if (bchannel->b_dtmf && bchannel->b_mode == 0)
245 ph_control(sock, DTMF_TONE_START, 0, "DSP-DTMF", 1, bchannel->b_mode);
246 if (bchannel->b_bf_len && bchannel->b_mode == 0)
247 ph_control_block(sock, DSP_BF_ENABLE_KEY, bchannel->b_bf_key, bchannel->b_bf_len, "DSP-CRYPT", bchannel->b_bf_len, bchannel->b_mode);
248 if (bchannel->b_conf)
249 ph_control(sock, DSP_CONF_JOIN, bchannel->b_conf, "DSP-CONF", bchannel->b_conf, bchannel->b_mode);
251 bchannel->b_state = BSTATE_ACTIVE;
257 void bchannel_destroy(struct bchannel *bchannel)
259 if (bchannel->b_sock > -1)
261 close(bchannel->b_sock);
262 bchannel->b_sock = -1;
263 bchannel->rebuffer_usage = 0;
265 bchannel->b_state = BSTATE_IDLE;
270 * whenever we get audio data from bchannel, we process it here
272 static void bchannel_receive(struct bchannel *bchannel, unsigned char *buffer, int len)
274 struct mISDNhead *hh = (struct mISDNhead *)buffer;
275 unsigned char *data = buffer + MISDN_HEADER_LEN;
276 unsigned int cont = *((unsigned int *)data);
279 struct bchannel *remote_bchannel;
282 if (hh->prim == PH_CONTROL_IND)
284 /* non dsp -> ignore ph_control */
285 if (bchannel->b_mode == 1 || bchannel->b_mode == 3)
289 CERROR(bchannel->call, NULL, "SHORT READ OF PH_CONTROL INDICATION\n");
292 if ((cont&(~DTMF_TONE_MASK)) == DTMF_TONE_VAL)
295 lcr_in_dtmf(bchannel->call, cont & DTMF_TONE_MASK);
301 CERROR(bchannel->call, NULL, "Blowfish crypt rejected.\n");
305 CDEBUG(bchannel->call, NULL, "Blowfish crypt enabled.\n");
309 CDEBUG(bchannel->call, NULL, "Unhandled bchannel control 0x%x.\n", cont);
313 if (hh->prim == PH_DATA_REQ)
315 if (!bchannel->b_txdata)
317 /* if tx is off, it may happen that fifos send us pending informations, we just ignore them */
318 CDEBUG(bchannel->call, NULL, "ignoring tx data, because 'txdata' is turned off\n");
323 if (hh->prim != PH_DATA_IND && hh->prim != DL_DATA_IND)
325 CERROR(bchannel->call, NULL, "Bchannel received unknown primitve: 0x%lx\n", hh->prim);
328 /* if calls are bridged, but not via dsp (no b_conf), forward here */
329 if (!bchannel->b_conf
331 && bchannel->call->bridge_call
332 && bchannel->call->bridge_call->bchannel) {
333 remote_bchannel = bchannel->call->bridge_call->bchannel;
336 char string[4096] = "";
338 sprintf(string+strlen(string), " %02x", data[i]);
341 CDEBUG(remote_bchannel->call, NULL, "Forwarding packet%s\n", string);
343 hh->prim = PH_DATA_REQ;
345 ret = sendto(remote_bchannel->b_sock, buffer, MISDN_HEADER_LEN+len, 0, NULL, 0);
347 CERROR(remote_bchannel->call, NULL, "Failed to send to socket %d\n", bchannel->b_sock);
350 /* calls will not process any audio data unless
351 * the call is connected OR interface features audio during call setup.
354 /* if rx is off, it may happen that fifos send us pending informations, we just ignore them */
355 if (bchannel->b_rxoff)
357 CDEBUG(bchannel->call, NULL, "ignoring data, because rx is turned off\n");
363 CDEBUG(bchannel->call, NULL, "ignoring data, because no call associated with bchannel\n");
366 if (!bchannel->call->audiopath)
368 /* return, because we have no audio from port */
372 if (bchannel->call->pipe[1] < 0)
379 if (bchannel->b_mode == 0 || bchannel->b_mode == 1)
382 for (i = 0; i < len; i++) {
388 /* no hdlc and rebuffer */
389 if (bchannel->call->rebuffer && !bchannel->call->hdlc) {
390 int u = bchannel->rebuffer_usage;
391 unsigned char * b = bchannel->rebuffer;
393 int fd = bchannel->call->pipe[1];
399 memcpy(b + u, d, 160 - u);
403 if (write(fd, b, 160) < 0)
413 if (write(fd, d, 160) < 0)
422 bchannel->rebuffer_usage = u + l;
424 len = write(bchannel->call->pipe[1], data, len);
431 close(bchannel->call->pipe[1]);
432 bchannel->call->pipe[1] = -1;
433 bchannel->rebuffer_usage = 0;
434 CDEBUG(bchannel->call, NULL, "broken pipe on bchannel pipe\n");
439 * transmit data to bchannel
441 void bchannel_transmit(struct bchannel *bchannel, unsigned char *data, int len)
443 unsigned char buff[1024 + MISDN_HEADER_LEN], *p = buff + MISDN_HEADER_LEN;
444 struct mISDNhead *frm = (struct mISDNhead *)buff;
448 if (bchannel->b_state != BSTATE_ACTIVE)
450 if (len > 1024 || len < 1)
452 switch(bchannel->b_mode)
455 for (i = 0; i < len; i++)
456 *p++ = flip_bits[*data++];
457 frm->prim = DL_DATA_REQ;
460 for (i = 0; i < len; i++)
461 *p++ = flip_bits[*data++];
462 frm->prim = PH_DATA_REQ;
465 memcpy(p, data, len);
466 frm->prim = DL_DATA_REQ;
469 memcpy(p, data, len);
470 frm->prim = PH_DATA_REQ;
474 ret = sendto(bchannel->b_sock, buff, MISDN_HEADER_LEN+len, 0, NULL, 0);
476 CERROR(bchannel->call, NULL, "Failed to send to socket %d\n", bchannel->b_sock);
483 void bchannel_join(struct bchannel *bchannel, unsigned short id)
487 sock = bchannel->b_sock;
489 bchannel->b_conf = (id<<16) + bchannel_pid;
490 bchannel->b_rxoff = 1;
492 bchannel->b_conf = 0;
493 bchannel->b_rxoff = 0;
495 if (bchannel->b_state == BSTATE_ACTIVE)
497 ph_control(sock, DSP_RECEIVE_OFF, bchannel->b_rxoff, "DSP-RX_OFF", bchannel->b_conf, bchannel->b_mode);
498 ph_control(sock, DSP_CONF_JOIN, bchannel->b_conf, "DSP-CONF", bchannel->b_conf, bchannel->b_mode);
506 void bchannel_dtmf(struct bchannel *bchannel, int on)
510 sock = bchannel->b_sock;
511 bchannel->b_dtmf = 1;
512 if (bchannel->b_state == BSTATE_ACTIVE && bchannel->b_mode == 0)
513 ph_control(sock, on?DTMF_TONE_START:DTMF_TONE_STOP, 0, "DSP-DTMF", 1, bchannel->b_mode);
520 void bchannel_blowfish(struct bchannel *bchannel, unsigned char *key, int len)
524 sock = bchannel->b_sock;
525 memcpy(bchannel->b_bf_key, key, len);
526 bchannel->b_bf_len = len;
527 if (bchannel->b_state == BSTATE_ACTIVE)
528 ph_control_block(sock, DSP_BF_ENABLE_KEY, bchannel->b_bf_key, bchannel->b_bf_len, "DSP-CRYPT", bchannel->b_bf_len, bchannel->b_mode);
535 void bchannel_pipeline(struct bchannel *bchannel, char *pipeline)
539 sock = bchannel->b_sock;
540 strncpy(bchannel->b_pipeline, pipeline, sizeof(bchannel->b_pipeline)-1);
541 if (bchannel->b_state == BSTATE_ACTIVE)
542 ph_control_block(sock, DSP_PIPELINE_CFG, bchannel->b_pipeline, strlen(bchannel->b_pipeline)+1, "DSP-PIPELINE", 0, bchannel->b_mode);
549 void bchannel_gain(struct bchannel *bchannel, int gain, int tx)
553 sock = bchannel->b_sock;
555 bchannel->b_tx_gain = gain;
557 bchannel->b_rx_gain = gain;
558 if (bchannel->b_state == BSTATE_ACTIVE && bchannel->b_mode == 0)
559 ph_control(sock, (tx)?DSP_VOL_CHANGE_TX:DSP_VOL_CHANGE_RX, gain, (tx)?"DSP-TX_GAIN":"DSP-RX_GAIN", gain, bchannel->b_mode);
564 * main loop for processing messages from mISDN
566 int bchannel_handle(void)
569 struct bchannel *bchannel;
570 unsigned char buffer[2048+MISDN_HEADER_LEN];
571 struct mISDNhead *hh = (struct mISDNhead *)buffer;
573 /* process all bchannels */
574 bchannel = bchannel_first;
577 /* handle message from bchannel */
578 if (bchannel->b_sock > -1)
580 ret = recv(bchannel->b_sock, buffer, sizeof(buffer), 0);
581 if (ret >= (int)MISDN_HEADER_LEN)
586 /* we don't care about confirms, we use rx data to sync tx */
590 /* we receive audio data, we respond to it AND we send tones */
595 bchannel_receive(bchannel, buffer, ret-MISDN_HEADER_LEN);
598 case PH_ACTIVATE_IND:
599 case DL_ESTABLISH_IND:
600 case PH_ACTIVATE_CNF:
601 case DL_ESTABLISH_CNF:
602 CDEBUG(bchannel->call, NULL, "DL_ESTABLISH confirm: bchannel is now activated (socket %d).\n", bchannel->b_sock);
603 bchannel_activated(bchannel);
606 case PH_DEACTIVATE_IND:
608 case PH_DEACTIVATE_CNF:
610 CDEBUG(bchannel->call, NULL, "DL_RELEASE confirm: bchannel is now de-activated (socket %d).\n", bchannel->b_sock);
611 // bchannel_deactivated(bchannel);
615 CERROR(bchannel->call, NULL, "child message not handled: prim(0x%x) socket(%d) data len(%d)\n", hh->prim, bchannel->b_sock, ret - MISDN_HEADER_LEN);
619 if (ret < 0 && errno != EWOULDBLOCK)
620 CERROR(bchannel->call, NULL, "Read from socket %d failed with return code %d\n", bchannel->b_sock, ret);
623 bchannel = bchannel->next;
626 /* if we received at least one b-frame, we will return 1 */
632 * bchannel channel handling
634 struct bchannel *bchannel_first = NULL;
635 struct bchannel *find_bchannel_handle(unsigned int handle)
637 struct bchannel *bchannel = bchannel_first;
641 if (bchannel->handle == handle)
643 bchannel = bchannel->next;
649 struct bchannel *find_bchannel_ref(unsigned int ref)
651 struct bchannel *bchannel = bchannel_first;
655 if (bchannel->ref == ref)
657 bchannel = bchannel->next;
663 struct bchannel *alloc_bchannel(unsigned int handle)
665 struct bchannel **bchannelp = &bchannel_first;
668 bchannelp = &((*bchannelp)->next);
670 *bchannelp = (struct bchannel *)calloc(1, sizeof(struct bchannel));
673 (*bchannelp)->handle = handle;
674 (*bchannelp)->b_state = BSTATE_IDLE;
675 (*bchannelp)->b_sock = -1;
680 void free_bchannel(struct bchannel *bchannel)
682 struct bchannel **temp = &bchannel_first;
686 if (*temp == bchannel)
688 *temp = (*temp)->next;
689 if (bchannel->b_sock > -1)
690 bchannel_destroy(bchannel);
693 if (bchannel->call->bchannel)
694 bchannel->call->bchannel = NULL;
699 temp = &((*temp)->next);