bchannel.c

   1 /*****************************************************************************\
   2 **                                                                           **
   3 ** Linux Call Router                                                         **
   4 **                                                                           **
   5 **---------------------------------------------------------------------------**
   6 ** Copyright: Andreas Eversberg                                              **
   7 **                                                                           **
   8 ** mISDN channel handlin for remote application                              **
   9 **                                                                           **
  10 \*****************************************************************************/
  11
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14 #include <unistd.h>
  15 #include <string.h>
  16 #include <poll.h>
  17 #include <errno.h>
  18 #include <sys/ioctl.h>
  19 #include <sys/types.h>
  20 #include <sys/stat.h>
  21 #include <fcntl.h>
  22 #include <netinet/udp.h>
  23 #include <netinet/in.h>
  24 #include <netdb.h>
  25 #include <sys/socket.h>
  26 #include <mISDNif.h>
  27
  28 #define AF_COMPATIBILITY_FUNC 1
  29 #define MISDN_OLD_AF_COMPATIBILITY 1
  30 #include <compat_af_isdn.h>
  31
  32 #define HAVE_ATTRIBUTE_always_inline 1
  33 #define HAVE_ARPA_INET_H 1
  34 #define HAVE_TIMERSUB 1
  35
  36 #include <asterisk/compiler.h>
  37 #include <asterisk/frame.h>
  38
  39 /* Choose if you want to have chan_lcr for Asterisk 1.4.x or CallWeaver 1.2.x */
  40 /* #define LCR_FOR_CALLWEAVER */
  41
  42 #ifdef LCR_FOR_CALLWEAVER
  43 #include <asterisk/phone_no_utils.h>
  44 #include <asterisk/logger.h>
  45 #include <asterisk/module.h>
  46 #include <asterisk/channel.h>
  47 #endif
  48
  49 #include "extension.h"
  50 #include "message.h"
  51 #include "lcrsocket.h"
  52 #include "cause.h"
  53 #include "select.h"
  54 #include "bchannel.h"
  55 #include "chan_lcr.h"
  56 #include "callerid.h"
  57
  58
  59 #ifndef ISDN_PID_L4_B_USER
  60 #define ISDN_PID_L4_B_USER 0x440000ff
  61 #endif
  62
  63 pid_t   bchannel_pid;
  64
  65 enum {
  66         BSTATE_IDLE,
  67         BSTATE_ACTIVATING,
  68         BSTATE_ACTIVE,
  69         BSTATE_DEACTIVATING,
  70 };
  71
  72
  73 int bchannel_initialize(void)
  74 {
  75         init_af_isdn();
  76
  77         return 0;
  78 }
  79
  80 void bchannel_deinitialize(void)
  81 {
  82 }
  83
  84 /*
  85  * send control information to the channel (dsp-module)
  86  */
  87 static void ph_control(int sock, unsigned int c1, unsigned int c2, char *trace_name, int trace_value, int b_mode)
  88 {
  89         unsigned char buffer[MISDN_HEADER_LEN+sizeof(int)+sizeof(int)];
  90         struct mISDNhead *ctrl = (struct mISDNhead *)buffer;
  91         unsigned int *d = (unsigned int *)(buffer+MISDN_HEADER_LEN);
  92         int ret;
  93
  94         if (b_mode != 0 && b_mode != 2)
  95                 return;
  96
  97         CDEBUG(NULL, NULL, "Sending PH_CONTROL %s %x,%x\n", trace_name, c1, c2);
  98         ctrl->prim = PH_CONTROL_REQ;
  99         ctrl->id = 0;
 100         *d++ = c1;
 101         *d++ = c2;
 102         ret = sendto(sock, buffer, MISDN_HEADER_LEN+sizeof(int)*2, 0, NULL, 0);
 103         if (ret < 0)
 104                 CERROR(NULL, NULL, "Failed to send to socket %d\n", sock);
 105 }
 106
 107 static void ph_control_block(int sock, unsigned int c1, void *c2, int c2_len, char *trace_name, int trace_value, int b_mode)
 108 {
 109         unsigned char buffer[MISDN_HEADER_LEN+sizeof(int)+c2_len];
 110         struct mISDNhead *ctrl = (struct mISDNhead *)buffer;
 111         unsigned int *d = (unsigned int *)(buffer+MISDN_HEADER_LEN);
 112         int ret;
 113
 114         if (b_mode != 0 && b_mode != 2)
 115                 return;
 116
 117         CDEBUG(NULL, NULL, "Sending PH_CONTROL (block) %s %x\n", trace_name, c1);
 118         ctrl->prim = PH_CONTROL_REQ;
 119         ctrl->id = 0;
 120         *d++ = c1;
 121         memcpy(d, c2, c2_len);
 122         ret = sendto(sock, buffer, MISDN_HEADER_LEN+sizeof(int)+c2_len, 0, NULL, 0);
 123         if (ret < 0)
 124                 CERROR(NULL, NULL, "Failed to send to socket %d\n", sock);
 125 }
 126
 127 static int bchannel_handle(struct lcr_fd *fd, unsigned int what, void *instance, int index);
 128
 129 /*
 130  * create stack
 131  */
 132 int bchannel_create(struct bchannel *bchannel, int mode)
 133 {
 134         int ret;
 135         struct sockaddr_mISDN addr;
 136
 137         if (bchannel->b_sock > -1) {
 138                 CERROR(bchannel->call, NULL, "Socket already created for handle 0x%x\n", bchannel->handle);
 139                 return 0;
 140         }
 141
 142         /* open socket */
 143         bchannel->b_mode = mode;
 144         switch(bchannel->b_mode) {
 145                 case 0:
 146                 CDEBUG(bchannel->call, NULL, "Open DSP audio\n");
 147                 bchannel->b_sock = socket(PF_ISDN, SOCK_DGRAM, ISDN_P_B_L2DSP);
 148                 break;
 149                 case 1:
 150                 CDEBUG(bchannel->call, NULL, "Open audio\n");
 151                 bchannel->b_sock = socket(PF_ISDN, SOCK_DGRAM, ISDN_P_B_RAW);
 152                 break;
 153                 case 2:
 154                 CDEBUG(bchannel->call, NULL, "Open DSP HDLC\n");
 155                 bchannel->b_sock = socket(PF_ISDN, SOCK_DGRAM, ISDN_P_B_L2DSPHDLC);
 156                 break;
 157                 case 3:
 158                 CDEBUG(bchannel->call, NULL, "Open HDLC\n");
 159                 bchannel->b_sock = socket(PF_ISDN, SOCK_DGRAM, ISDN_P_B_HDLC);
 160                 break;
 161         }
 162         if (bchannel->b_sock < 0) {
 163                 CERROR(bchannel->call, NULL, "Failed to open bchannel-socket for handle 0x%x with mISDN-DSP layer. Did you load mISDN_dsp.ko?\n", bchannel->handle);
 164                 return 0;
 165         }
 166
 167         /* register fd */
 168         memset(&bchannel->lcr_fd, 0, sizeof(bchannel->lcr_fd));
 169         bchannel->lcr_fd.fd = bchannel->b_sock;
 170         register_fd(&bchannel->lcr_fd, LCR_FD_READ | LCR_FD_EXCEPT, bchannel_handle, bchannel, 0);
 171
 172         /* bind socket to bchannel */
 173         addr.family = AF_ISDN;
 174         addr.dev = (bchannel->handle>>8);
 175         addr.channel = bchannel->handle & 0xff;
 176         ret = bind(bchannel->b_sock, (struct sockaddr *)&addr, sizeof(addr));
 177         if (ret < 0) {
 178                 CERROR(bchannel->call, NULL, "Failed to bind bchannel-socket for handle 0x%x with mISDN-DSP layer. (port %d, channel %d) Did you load mISDN_dsp.ko?\n", bchannel->handle, addr.dev, addr.channel);
 179                 unregister_fd(&bchannel->lcr_fd);
 180                 close(bchannel->b_sock);
 181                 bchannel->b_sock = -1;
 182                 return 0;
 183         }
 184         return 1;
 185 }
 186
 187
 188 /*
 189  * activate / deactivate request
 190  */
 191 void bchannel_activate(struct bchannel *bchannel, int activate)
 192 {
 193         struct mISDNhead act;
 194         int ret;
 195
 196         /* activate bchannel */
 197         CDEBUG(bchannel->call, NULL, "%sActivating B-channel.\n", activate?"":"De-");
 198         switch(bchannel->b_mode) {
 199                 case 0:
 200                 case 2:
 201                 act.prim = (activate)?DL_ESTABLISH_REQ:DL_RELEASE_REQ;
 202                 break;
 203                 case 1:
 204                 case 3:
 205                 act.prim = (activate)?PH_ACTIVATE_REQ:PH_DEACTIVATE_REQ;
 206                 break;
 207         }
 208         act.id = 0;
 209         ret = sendto(bchannel->b_sock, &act, MISDN_HEADER_LEN, 0, NULL, 0);
 210         if (ret < 0)
 211                 CERROR(bchannel->call, NULL, "Failed to send to socket %d\n", bchannel->b_sock);
 212
 213         bchannel->b_state = (activate)?BSTATE_ACTIVATING:BSTATE_DEACTIVATING;
 214 }
 215
 216
 217 /*
 218  * set features
 219  */
 220 static void bchannel_activated(struct bchannel *bchannel)
 221 {
 222         int sock;
 223
 224         sock = bchannel->b_sock;
 225
 226         /* set dsp features */
 227         if (bchannel->b_txdata)
 228                 ph_control(sock, (bchannel->b_txdata)?DSP_TXDATA_ON:DSP_TXDATA_OFF, 0, "DSP-TXDATA", bchannel->b_txdata, bchannel->b_mode);
 229         if (bchannel->b_delay && bchannel->b_mode == 0)
 230                 ph_control(sock, DSP_DELAY, bchannel->b_delay, "DSP-DELAY", bchannel->b_delay, bchannel->b_mode);
 231         if (bchannel->b_tx_dejitter && bchannel->b_mode == 0)
 232                 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);
 233         if (bchannel->b_tx_gain && bchannel->b_mode == 0)
 234                 ph_control(sock, DSP_VOL_CHANGE_TX, bchannel->b_tx_gain, "DSP-TX_GAIN", bchannel->b_tx_gain, bchannel->b_mode);
 235         if (bchannel->b_rx_gain && bchannel->b_mode == 0)
 236                 ph_control(sock, DSP_VOL_CHANGE_RX, bchannel->b_rx_gain, "DSP-RX_GAIN", bchannel->b_rx_gain, bchannel->b_mode);
 237         if (bchannel->b_pipeline[0] && bchannel->b_mode == 0)
 238                 ph_control_block(sock, DSP_PIPELINE_CFG, bchannel->b_pipeline, strlen(bchannel->b_pipeline)+1, "DSP-PIPELINE", 0, bchannel->b_mode);
 239         if (bchannel->b_conf)
 240                 ph_control(sock, DSP_CONF_JOIN, bchannel->b_conf, "DSP-CONF", bchannel->b_conf, bchannel->b_mode);
 241         if (bchannel->b_echo)
 242                 ph_control(sock, DSP_ECHO_ON, 0, "DSP-ECHO", 1, bchannel->b_mode);
 243         if (bchannel->b_tone && bchannel->b_mode == 0)
 244                 ph_control(sock, DSP_TONE_PATT_ON, bchannel->b_tone, "DSP-TONE", bchannel->b_tone, bchannel->b_mode);
 245         if (bchannel->b_rxoff)
 246                 ph_control(sock, DSP_RECEIVE_OFF, 0, "DSP-RXOFF", 1, bchannel->b_mode);
 247 //      if (bchannel->b_txmix && bchannel->b_mode == 0)
 248 //              ph_control(sock, DSP_MIX_ON, 0, "DSP-MIX", 1, bchannel->b_mode);
 249         if (bchannel->b_dtmf && bchannel->b_mode == 0)
 250                 ph_control(sock, DTMF_TONE_START, 0, "DSP-DTMF", 1, bchannel->b_mode);
 251         if (bchannel->b_bf_len && bchannel->b_mode == 0)
 252                 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);
 253         if (bchannel->b_conf)
 254                 ph_control(sock, DSP_CONF_JOIN, bchannel->b_conf, "DSP-CONF", bchannel->b_conf, bchannel->b_mode);
 255
 256         bchannel->b_state = BSTATE_ACTIVE;
 257 }
 258
 259 /*
 260  * destroy stack
 261  */
 262 void bchannel_destroy(struct bchannel *bchannel)
 263 {
 264         if (bchannel->b_sock > -1) {
 265                 unregister_fd(&bchannel->lcr_fd);
 266                 close(bchannel->b_sock);
 267                 bchannel->b_sock = -1;
 268         }
 269         bchannel->b_state = BSTATE_IDLE;
 270 }
 271
 272
 273 /*
 274  * whenever we get audio data from bchannel, we process it here
 275  */
 276 static void bchannel_receive(struct bchannel *bchannel, unsigned char *buffer, int len)
 277 {
 278         struct mISDNhead *hh = (struct mISDNhead *)buffer;
 279         unsigned char *data = buffer + MISDN_HEADER_LEN;
 280         unsigned int cont = *((unsigned int *)data);
 281         unsigned char *d;
 282         int i;
 283         struct bchannel *remote_bchannel;
 284         int ret;
 285
 286         if (hh->prim == PH_CONTROL_IND) {
 287                 /* non dsp -> ignore ph_control */
 288                 if (bchannel->b_mode == 1 || bchannel->b_mode == 3)
 289                         return;
 290                 if (len < 4) {
 291                         CERROR(bchannel->call, NULL, "SHORT READ OF PH_CONTROL INDICATION\n");
 292                         return;
 293                 }
 294                 if ((cont&(~DTMF_TONE_MASK)) == DTMF_TONE_VAL) {
 295                         if (bchannel->call)
 296                                 lcr_in_dtmf(bchannel->call, cont & DTMF_TONE_MASK);
 297                         return;
 298                 }
 299                 switch(cont) {
 300                         case DSP_BF_REJECT:
 301                         CERROR(bchannel->call, NULL, "Blowfish crypt rejected.\n");
 302                         break;
 303
 304                         case DSP_BF_ACCEPT:
 305                         CDEBUG(bchannel->call, NULL, "Blowfish crypt enabled.\n");
 306                         break;
 307
 308                         default:
 309                         CDEBUG(bchannel->call, NULL, "Unhandled bchannel control 0x%x.\n", cont);
 310                 }
 311                 return;
 312         }
 313         if (hh->prim == PH_DATA_REQ) {
 314                 if (!bchannel->b_txdata) {
 315                         /* if tx is off, it may happen that fifos send us pending informations, we just ignore them */
 316                         CDEBUG(bchannel->call, NULL, "ignoring tx data, because 'txdata' is turned off\n");
 317                         return;
 318                 }
 319                 return;
 320         }
 321         if (hh->prim != PH_DATA_IND && hh->prim != DL_DATA_IND) {
 322                 CERROR(bchannel->call, NULL, "Bchannel received unknown primitve: 0x%lx\n", hh->prim);
 323                 return;
 324         }
 325         /* if calls are bridged, but not via dsp (no b_conf), forward here */
 326         if (!bchannel->b_conf
 327          && bchannel->call
 328          && bchannel->call->bridge_call
 329          && bchannel->call->bridge_call->bchannel) {
 330                 remote_bchannel = bchannel->call->bridge_call->bchannel;
 331 #if 0
 332                 int i = 0;
 333                 char string[4096] = "";
 334                 while(i < len) {
 335                         sprintf(string+strlen(string), " %02x", data[i]);
 336                         i++;
 337                 }
 338                 CDEBUG(remote_bchannel->call, NULL, "Forwarding packet%s\n", string);
 339 #endif
 340                 hh->prim = PH_DATA_REQ;
 341                 hh->id = 0;
 342                 ret = sendto(remote_bchannel->b_sock, buffer, MISDN_HEADER_LEN+len, 0, NULL, 0);
 343                 if (ret < 0)
 344                         CERROR(remote_bchannel->call, NULL, "Failed to send to socket %d\n", bchannel->b_sock);
 345                 return;
 346         }
 347         /* calls will not process any audio data unless
 348          * the call is connected OR interface features audio during call setup.
 349          */
 350
 351         /* if rx is off, it may happen that fifos send us pending informations, we just ignore them */
 352         if (bchannel->b_rxoff) {
 353                 CDEBUG(bchannel->call, NULL, "ignoring data, because rx is turned off\n");
 354                 return;
 355         }
 356
 357         if (!bchannel->call) {
 358                 CDEBUG(bchannel->call, NULL, "ignoring data, because no call associated with bchannel\n");
 359                 return;
 360         }
 361         if (!bchannel->call->audiopath) {
 362                 /* return, because we have no audio from port */
 363                 return;
 364         }
 365
 366         if (bchannel->call->pipe[1] < 0) {
 367                 /* nobody there */
 368                 return;
 369         }
 370
 371         /* if no hdlc */
 372         if (bchannel->b_mode == 0 || bchannel->b_mode == 1) {
 373                 d = data;
 374                 for (i = 0; i < len; i++) {
 375                         *d = flip_bits[*d];
 376                         d++;
 377                 }
 378         }
 379
 380
 381         len = write(bchannel->call->pipe[1], data, len);
 382         if (len < 0)
 383                 goto errout;
 384
 385         return;
 386  errout:
 387         close(bchannel->call->pipe[1]);
 388         bchannel->call->pipe[1] = -1;
 389         CDEBUG(bchannel->call, NULL, "broken pipe on bchannel pipe\n");
 390 }
 391
 392
 393 /*
 394  * transmit data to bchannel
 395  */
 396 void bchannel_transmit(struct bchannel *bchannel, unsigned char *data, int len)
 397 {
 398         unsigned char buff[1024 + MISDN_HEADER_LEN], *p = buff + MISDN_HEADER_LEN;
 399         struct mISDNhead *frm = (struct mISDNhead *)buff;
 400         int ret;
 401         int i;
 402
 403         if (bchannel->b_state != BSTATE_ACTIVE)
 404                 return;
 405         if (len > 1024 || len < 1)
 406                 return;
 407         switch(bchannel->b_mode) {
 408         case 0:
 409                 for (i = 0; i < len; i++)
 410                         *p++ = flip_bits[*data++];
 411                 frm->prim = DL_DATA_REQ;
 412                 break;
 413         case 1:
 414                 for (i = 0; i < len; i++)
 415                         *p++ = flip_bits[*data++];
 416                 frm->prim = PH_DATA_REQ;
 417                 break;
 418         case 2:
 419                 memcpy(p, data, len);
 420                 frm->prim = DL_DATA_REQ;
 421                 break;
 422         case 3:
 423                 memcpy(p, data, len);
 424                 frm->prim = PH_DATA_REQ;
 425                 break;
 426         }
 427         frm->id = 0;
 428         ret = sendto(bchannel->b_sock, buff, MISDN_HEADER_LEN+len, 0, NULL, 0);
 429         if (ret < 0)
 430                 CERROR(bchannel->call, NULL, "Failed to send to socket %d\n", bchannel->b_sock);
 431 }
 432
 433
 434 /*
 435  * join bchannel
 436  */
 437 void bchannel_join(struct bchannel *bchannel, unsigned short id)
 438 {
 439         int sock;
 440
 441         sock = bchannel->b_sock;
 442         if (id) {
 443                 bchannel->b_conf = (id<<16) + bchannel_pid;
 444                 bchannel->b_rxoff = 1;
 445         } else {
 446                 bchannel->b_conf = 0;
 447                 bchannel->b_rxoff = 0;
 448         }
 449         if (bchannel->b_state == BSTATE_ACTIVE) {
 450                 ph_control(sock, DSP_RECEIVE_OFF, bchannel->b_rxoff, "DSP-RX_OFF", bchannel->b_conf, bchannel->b_mode);
 451                 ph_control(sock, DSP_CONF_JOIN, bchannel->b_conf, "DSP-CONF", bchannel->b_conf, bchannel->b_mode);
 452         }
 453 }
 454
 455
 456 /*
 457  * dtmf bchannel
 458  */
 459 void bchannel_dtmf(struct bchannel *bchannel, int on)
 460 {
 461         int sock;
 462
 463         sock = bchannel->b_sock;
 464         bchannel->b_dtmf = on;
 465         if (bchannel->b_state == BSTATE_ACTIVE && bchannel->b_mode == 0)
 466                 ph_control(sock, on?DTMF_TONE_START:DTMF_TONE_STOP, 0, "DSP-DTMF", 1, bchannel->b_mode);
 467 }
 468
 469
 470 /*
 471  * blowfish bchannel
 472  */
 473 void bchannel_blowfish(struct bchannel *bchannel, unsigned char *key, int len)
 474 {
 475         int sock;
 476
 477         sock = bchannel->b_sock;
 478         memcpy(bchannel->b_bf_key, key, len);
 479         bchannel->b_bf_len = len;
 480         if (bchannel->b_state == BSTATE_ACTIVE)
 481                 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);
 482 }
 483
 484
 485 /*
 486  * pipeline bchannel
 487  */
 488 void bchannel_pipeline(struct bchannel *bchannel, char *pipeline)
 489 {
 490         int sock;
 491
 492         sock = bchannel->b_sock;
 493         strncpy(bchannel->b_pipeline, pipeline, sizeof(bchannel->b_pipeline)-1);
 494         if (bchannel->b_state == BSTATE_ACTIVE)
 495                 ph_control_block(sock, DSP_PIPELINE_CFG, bchannel->b_pipeline, strlen(bchannel->b_pipeline)+1, "DSP-PIPELINE", 0, bchannel->b_mode);
 496 }
 497
 498
 499 /*
 500  * gain bchannel
 501  */
 502 void bchannel_gain(struct bchannel *bchannel, int gain, int tx)
 503 {
 504         int sock;
 505
 506         sock = bchannel->b_sock;
 507         if (tx)
 508                 bchannel->b_tx_gain = gain;
 509         else
 510                 bchannel->b_rx_gain = gain;
 511         if (bchannel->b_state == BSTATE_ACTIVE && bchannel->b_mode == 0)
 512                 ph_control(sock, (tx)?DSP_VOL_CHANGE_TX:DSP_VOL_CHANGE_RX, gain, (tx)?"DSP-TX_GAIN":"DSP-RX_GAIN", gain, bchannel->b_mode);
 513 }
 514
 515
 516 /*
 517  * main loop for processing messages from mISDN
 518  */
 519 static int bchannel_handle(struct lcr_fd *fd, unsigned int what, void *instance, int index)
 520 {
 521         struct bchannel *bchannel = (struct bchannel *)instance;
 522         int ret;
 523         unsigned char buffer[2048+MISDN_HEADER_LEN];
 524         struct mISDNhead *hh = (struct mISDNhead *)buffer;
 525
 526         ret = recv(bchannel->b_sock, buffer, sizeof(buffer), 0);
 527         if (ret >= (int)MISDN_HEADER_LEN) {
 528                 switch(hh->prim) {
 529                         /* we don't care about confirms, we use rx data to sync tx */
 530                         case PH_DATA_CNF:
 531                         break;
 532
 533                         /* we receive audio data, we respond to it AND we send tones */
 534                         case PH_DATA_IND:
 535                         case PH_DATA_REQ:
 536                         case DL_DATA_IND:
 537                         case PH_CONTROL_IND:
 538                         bchannel_receive(bchannel, buffer, ret-MISDN_HEADER_LEN);
 539                         break;
 540
 541                         case PH_ACTIVATE_IND:
 542                         case DL_ESTABLISH_IND:
 543                         case PH_ACTIVATE_CNF:
 544                         case DL_ESTABLISH_CNF:
 545                         CDEBUG(bchannel->call, NULL, "DL_ESTABLISH confirm: bchannel is now activated (socket %d).\n", bchannel->b_sock);
 546                         bchannel_activated(bchannel);
 547                         break;
 548
 549                         case PH_DEACTIVATE_IND:
 550                         case DL_RELEASE_IND:
 551                         case PH_DEACTIVATE_CNF:
 552                         case DL_RELEASE_CNF:
 553                         CDEBUG(bchannel->call, NULL, "DL_RELEASE confirm: bchannel is now de-activated (socket %d).\n", bchannel->b_sock);
 554 //                                      bchannel_deactivated(bchannel);
 555                         break;
 556
 557                         default:
 558                         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);
 559                 }
 560         } else {
 561 //              if (ret < 0 && errno != EWOULDBLOCK)
 562                 CERROR(bchannel->call, NULL, "Read from socket %d failed with return code %d\n", bchannel->b_sock, ret);
 563         }
 564
 565         /* if we received at least one b-frame, we will return 1 */
 566         return 0;
 567 }
 568
 569
 570 /*
 571  * bchannel channel handling
 572  */
 573 struct bchannel *bchannel_first = NULL;
 574 struct bchannel *find_bchannel_handle(unsigned int handle)
 575 {
 576         struct bchannel *bchannel = bchannel_first;
 577
 578         while(bchannel) {
 579                 if (bchannel->handle == handle)
 580                         break;
 581                 bchannel = bchannel->next;
 582         }
 583         return bchannel;
 584 }
 585
 586 #if 0
 587 struct bchannel *find_bchannel_ref(unsigned int ref)
 588 {
 589         struct bchannel *bchannel = bchannel_first;
 590
 591         while(bchannel) {
 592                 if (bchannel->ref == ref)
 593                         break;
 594                 bchannel = bchannel->next;
 595         }
 596         return bchannel;
 597 }
 598 #endif
 599
 600 struct bchannel *alloc_bchannel(unsigned int handle)
 601 {
 602         struct bchannel **bchannelp = &bchannel_first;
 603
 604         while(*bchannelp)
 605                 bchannelp = &((*bchannelp)->next);
 606
 607         *bchannelp = (struct bchannel *)calloc(1, sizeof(struct bchannel));
 608         if (!*bchannelp)
 609                 return NULL;
 610         (*bchannelp)->handle = handle;
 611         (*bchannelp)->b_state = BSTATE_IDLE;
 612         (*bchannelp)->b_sock = -1;
 613
 614         return *bchannelp;
 615 }
 616
 617 void free_bchannel(struct bchannel *bchannel)
 618 {
 619         struct bchannel **temp = &bchannel_first;
 620
 621         while(*temp) {
 622                 if (*temp == bchannel) {
 623                         *temp = (*temp)->next;
 624                         if (bchannel->b_sock > -1)
 625                                 bchannel_destroy(bchannel);
 626                         if (bchannel->call) {
 627                                 if (bchannel->call->bchannel)
 628                                         bchannel->call->bchannel = NULL;
 629                         }
 630                         free(bchannel);
 631                         return;
 632                 }
 633                 temp = &((*temp)->next);
 634         }
 635 }
 636
 637