/*****************************************************************************\ ** ** ** Linux Call Router ** ** ** **---------------------------------------------------------------------------** ** Copyright: Andreas Eversberg ** ** ** ** mISDN channel handlin for remote application ** ** ** \*****************************************************************************/ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "extension.h" #include "message.h" #include "lcrsocket.h" #include "cause.h" #include "bchannel.h" #include "chan_lcr.h" #include "callerid.h" #ifndef ISDN_PID_L4_B_USER #define ISDN_PID_L4_B_USER 0x440000ff #endif pid_t bchannel_pid; enum { BSTATE_IDLE, BSTATE_ACTIVATING, BSTATE_ACTIVE, BSTATE_DEACTIVATING, }; int bchannel_initialize(void) { return(0); } void bchannel_deinitialize(void) { } /* * send control information to the channel (dsp-module) */ static void ph_control(unsigned long handle, unsigned long c1, unsigned long c2, char *trace_name, int trace_value, int b_mode) { unsigned char buffer[MISDN_HEADER_LEN+sizeof(int)+sizeof(int)]; struct mISDNhead *ctrl = (struct mISDNhead *)buffer; unsigned long *d = (unsigned long *)(buffer+MISDN_HEADER_LEN); int ret; if (b_mode != 0 && b_mode != 2) return; CDEBUG(NULL, NULL, "Sending PH_CONTROL %s %x,%x\n", trace_name, c1, c2); ctrl->prim = PH_CONTROL_REQ; ctrl->id = 0; *d++ = c1; *d++ = c2; ret = sendto(handle, buffer, MISDN_HEADER_LEN+sizeof(int)*2, 0, NULL, 0); if (ret < 0) CERROR(NULL, NULL, "Failed to send to socket %d\n", handle); } static void ph_control_block(unsigned long handle, unsigned long c1, void *c2, int c2_len, char *trace_name, int trace_value, int b_mode) { unsigned char buffer[MISDN_HEADER_LEN+sizeof(int)+c2_len]; struct mISDNhead *ctrl = (struct mISDNhead *)buffer; unsigned long *d = (unsigned long *)(buffer+MISDN_HEADER_LEN); int ret; if (b_mode != 0 && b_mode != 2) return; CDEBUG(NULL, NULL, "Sending PH_CONTROL (block) %s %x\n", trace_name, c1); ctrl->prim = PH_CONTROL_REQ; ctrl->id = 0; *d++ = c1; memcpy(d, c2, c2_len); ret = sendto(handle, buffer, MISDN_HEADER_LEN+sizeof(int)+c2_len, 0, NULL, 0); if (ret < 0) CERROR(NULL, NULL, "Failed to send to socket %d\n", handle); } /* * create stack */ int bchannel_create(struct bchannel *bchannel, int mode) { int ret; unsigned long on = 1; struct sockaddr_mISDN addr; if (bchannel->b_sock) { CERROR(NULL, NULL, "Socket already created for handle 0x%x\n", bchannel->handle); return(0); } /* open socket */ bchannel->b_mode = mode; switch(bchannel->b_mode) { case 0: bchannel->b_sock = socket(PF_ISDN, SOCK_DGRAM, ISDN_P_B_L2DSP); break; case 1: bchannel->b_sock = socket(PF_ISDN, SOCK_DGRAM, ISDN_P_B_RAW); break; case 2: bchannel->b_sock = socket(PF_ISDN, SOCK_DGRAM, ISDN_P_B_L2DSPHDLC); break; case 3: bchannel->b_sock = socket(PF_ISDN, SOCK_DGRAM, ISDN_P_B_HDLC); break; } if (bchannel->b_sock < 0) { CERROR(NULL, NULL, "Failed to open bchannel-socket for handle 0x%x with mISDN-DSP layer. Did you load mISDNdsp.ko?\n", bchannel->handle); return(0); } /* set nonblocking io */ ret = ioctl(bchannel->b_sock, FIONBIO, &on); if (ret < 0) { CERROR(NULL, NULL, "Failed to set bchannel-socket handle 0x%x into nonblocking IO\n", bchannel->handle); close(bchannel->b_sock); bchannel->b_sock = -1; return(0); } /* bind socket to bchannel */ addr.family = AF_ISDN; addr.dev = (bchannel->handle>>8)-1; addr.channel = bchannel->handle & 0xff; ret = bind(bchannel->b_sock, (struct sockaddr *)&addr, sizeof(addr)); if (ret < 0) { CERROR(NULL, 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 + 1, addr.channel); close(bchannel->b_sock); bchannel->b_sock = -1; return(0); } return(1); } /* * activate / deactivate request */ void bchannel_activate(struct bchannel *bchannel, int activate) { struct mISDNhead act; int ret; /* activate bchannel */ CDEBUG(NULL, NULL, "%sActivating B-channel.\n", activate?"":"De-"); switch(bchannel->b_mode) { case 0: case 2: act.prim = (activate)?DL_ESTABLISH_REQ:DL_RELEASE_REQ; break; case 1: case 3: act.prim = (activate)?PH_ACTIVATE_REQ:PH_DEACTIVATE_REQ; break; } act.id = 0; ret = sendto(bchannel->b_sock, &act, MISDN_HEADER_LEN, 0, NULL, 0); if (ret < 0) CERROR(NULL, NULL, "Failed to send to socket %d\n", bchannel->b_sock); bchannel->b_state = (activate)?BSTATE_ACTIVATING:BSTATE_DEACTIVATING; } /* * set features */ static void bchannel_activated(struct bchannel *bchannel) { int handle; handle = bchannel->b_sock; /* set dsp features */ if (bchannel->b_txdata) ph_control(handle, (bchannel->b_txdata)?DSP_TXDATA_ON:DSP_TXDATA_OFF, 0, "DSP-TXDATA", bchannel->b_txdata, bchannel->b_mode); if (bchannel->b_delay) ph_control(handle, DSP_DELAY, bchannel->b_delay, "DSP-DELAY", bchannel->b_delay, bchannel->b_mode); if (bchannel->b_tx_dejitter) ph_control(handle, (bchannel->b_tx_dejitter)?DSP_TX_DEJITTER:DSP_TX_DEJ_OFF, 0, "DSP-TX_DEJITTER", bchannel->b_tx_dejitter, bchannel->b_mode); if (bchannel->b_tx_gain) ph_control(handle, DSP_VOL_CHANGE_TX, bchannel->b_tx_gain, "DSP-TX_GAIN", bchannel->b_tx_gain, bchannel->b_mode); if (bchannel->b_rx_gain) ph_control(handle, DSP_VOL_CHANGE_RX, bchannel->b_rx_gain, "DSP-RX_GAIN", bchannel->b_rx_gain, bchannel->b_mode); if (bchannel->b_pipeline[0]) ph_control_block(handle, DSP_PIPELINE_CFG, bchannel->b_pipeline, strlen(bchannel->b_pipeline)+1, "DSP-PIPELINE", 0, bchannel->b_mode); if (bchannel->b_conf) ph_control(handle, DSP_CONF_JOIN, bchannel->b_conf, "DSP-CONF", bchannel->b_conf, bchannel->b_mode); if (bchannel->b_echo) ph_control(handle, DSP_ECHO_ON, 0, "DSP-ECHO", 1, bchannel->b_mode); if (bchannel->b_tone) ph_control(handle, DSP_TONE_PATT_ON, bchannel->b_tone, "DSP-TONE", bchannel->b_tone, bchannel->b_mode); if (bchannel->b_rxoff) ph_control(handle, DSP_RECEIVE_OFF, 0, "DSP-RXOFF", 1, bchannel->b_mode); // if (bchannel->b_txmix) // ph_control(handle, DSP_MIX_ON, 0, "DSP-MIX", 1, bchannel->b_mode); if (bchannel->b_dtmf) ph_control(handle, DTMF_TONE_START, 0, "DSP-DTMF", 1, bchannel->b_mode); if (bchannel->b_bf_len) ph_control_block(handle, DSP_BF_ENABLE_KEY, bchannel->b_bf_key, bchannel->b_bf_len, "DSP-CRYPT", bchannel->b_bf_len, bchannel->b_mode); if (bchannel->b_conf) ph_control(handle, DSP_CONF_JOIN, bchannel->b_conf, "DSP-CONF", bchannel->b_conf, bchannel->b_mode); bchannel->b_state = BSTATE_ACTIVE; } /* * destroy stack */ void bchannel_destroy(struct bchannel *bchannel) { if (bchannel->b_sock > -1) { close(bchannel->b_sock); bchannel->b_sock = -1; } bchannel->b_state = BSTATE_IDLE; } /* * whenever we get audio data from bchannel, we process it here */ static void bchannel_receive(struct bchannel *bchannel, unsigned char *buffer, int len) { struct mISDNhead *hh = (struct mISDNhead *)buffer; unsigned char *data = buffer + MISDN_HEADER_LEN; unsigned long cont = *((unsigned long *)data); struct bchannel *remote_bchannel; int ret; if (hh->prim == PH_CONTROL_IND) { if (len < 4) { CERROR(NULL, NULL, "SHORT READ OF PH_CONTROL INDICATION\n"); return; } if ((cont&(~DTMF_TONE_MASK)) == DTMF_TONE_VAL) { if (bchannel->call) lcr_in_dtmf(bchannel->call, cont & DTMF_TONE_MASK); return; } switch(cont) { case DSP_BF_REJECT: CERROR(NULL, NULL, "Blowfish crypt rejected.\n"); break; case DSP_BF_ACCEPT: CDEBUG(NULL, NULL, "Blowfish crypt enabled.\n"); break; default: CDEBUG(NULL, NULL, "Unhandled bchannel control 0x%x.\n", cont); } return; } if (hh->prim == PH_DATA_REQ) { if (!bchannel->b_txdata) { /* if tx is off, it may happen that fifos send us pending informations, we just ignore them */ CDEBUG(NULL, NULL, "ignoring tx data, because 'txdata' is turned off\n"); return; } return; } if (hh->prim != PH_DATA_IND && hh->prim != DL_DATA_IND) { CERROR(NULL, NULL, "Bchannel received unknown primitve: 0x%lx\n", hh->prim); return; } /* if call is bridged and in non-dsp mode */ if (bchannel->b_conf && (bchannel->b_mode == 1 || bchannel->b_mode == 3) && bchannel->call && bchannel->call->bridge_call && bchannel->call->bridge_call->bchannel) { remote_bchannel = bchannel->call->bridge_call->bchannel; if (remote_bchannel->b_mode == 1 || remote_bchannel->b_mode == 3) { hh->prim = PH_DATA_REQ; ret = sendto(remote_bchannel->b_sock, buffer, MISDN_HEADER_LEN+len, 0, NULL, 0); if (ret < 0) CERROR(NULL, NULL, "Failed to send to socket %d\n", bchannel->b_sock); return; } } /* calls will not process any audio data unless * the call is connected OR interface features audio during call setup. */ /* if rx is off, it may happen that fifos send us pending informations, we just ignore them */ if (bchannel->b_rxoff) { CDEBUG(NULL, NULL, "ignoring data, because rx is turned off\n"); return; } if (!bchannel->call) { CDEBUG(NULL, NULL, "ignoring data, because no call associated with bchannel\n"); return; } if (!bchannel->call->audiopath) { /* return, because we have no audio from port */ return; } if (bchannel->call->pipe[1] > -1) { len = write(bchannel->call->pipe[1], data, len); if (len < 0) { close(bchannel->call->pipe[1]); bchannel->call->pipe[1] = -1; CDEBUG(NULL, NULL, "broken pipe on bchannel pipe\n"); return; } } } /* * transmit data to bchannel */ void bchannel_transmit(struct bchannel *bchannel, unsigned char *data, int len) { unsigned char buff[1024 + MISDN_HEADER_LEN], *p = buff + MISDN_HEADER_LEN; struct mISDNhead *frm = (struct mISDNhead *)buff; int ret; int i; if (bchannel->b_state != BSTATE_ACTIVE) return; if (len > 1024 || len < 1) return; for (i = 0; i < len; i++) *p++ = flip_bits[*data++]; switch(bchannel->b_mode) { case 0: case 2: frm->prim = DL_DATA_REQ; break; case 1: case 3: frm->prim = PH_DATA_REQ; break; } frm->id = 0; ret = sendto(bchannel->b_sock, buff, MISDN_HEADER_LEN+len, 0, NULL, 0); if (ret < 0) CERROR(NULL, NULL, "Failed to send to socket %d\n", bchannel->b_sock); } /* * join bchannel */ void bchannel_join(struct bchannel *bchannel, unsigned short id) { int handle; handle = bchannel->b_sock; if (id) { bchannel->b_conf = (id<<16) + bchannel_pid; bchannel->b_rxoff = 1; } else { bchannel->b_conf = 0; bchannel->b_rxoff = 0; } if (bchannel->b_state == BSTATE_ACTIVE) { ph_control(handle, DSP_RECEIVE_OFF, bchannel->b_rxoff, "DSP-RX_OFF", bchannel->b_conf, bchannel->b_mode); ph_control(handle, DSP_CONF_JOIN, bchannel->b_conf, "DSP-CONF", bchannel->b_conf, bchannel->b_mode); } } /* * dtmf bchannel */ void bchannel_dtmf(struct bchannel *bchannel, int on) { int handle; handle = bchannel->b_sock; bchannel->b_dtmf = 1; if (bchannel->b_state == BSTATE_ACTIVE) ph_control(handle, on?DTMF_TONE_START:DTMF_TONE_STOP, 0, "DSP-DTMF", 1, bchannel->b_mode); } /* * blowfish bchannel */ void bchannel_blowfish(struct bchannel *bchannel, unsigned char *key, int len) { int handle; handle = bchannel->b_sock; memcpy(bchannel->b_bf_key, key, len); bchannel->b_bf_len = len; if (bchannel->b_state == BSTATE_ACTIVE) ph_control_block(handle, DSP_BF_ENABLE_KEY, bchannel->b_bf_key, bchannel->b_bf_len, "DSP-CRYPT", bchannel->b_bf_len, bchannel->b_mode); } /* * pipeline bchannel */ void bchannel_pipeline(struct bchannel *bchannel, char *pipeline) { int handle; handle = bchannel->b_sock; strncpy(bchannel->b_pipeline, pipeline, sizeof(bchannel->b_pipeline)-1); if (bchannel->b_state == BSTATE_ACTIVE) ph_control_block(handle, DSP_PIPELINE_CFG, bchannel->b_pipeline, strlen(bchannel->b_pipeline)+1, "DSP-PIPELINE", 0, bchannel->b_mode); } /* * gain bchannel */ void bchannel_gain(struct bchannel *bchannel, int gain, int tx) { int handle; handle = bchannel->b_sock; if (tx) bchannel->b_tx_gain = gain; else bchannel->b_rx_gain = gain; if (bchannel->b_state == BSTATE_ACTIVE) ph_control(handle, (tx)?DSP_VOL_CHANGE_TX:DSP_VOL_CHANGE_RX, gain, (tx)?"DSP-TX_GAIN":"DSP-RX_GAIN", gain, bchannel->b_mode); } /* * main loop for processing messages from mISDN */ int bchannel_handle(void) { int ret, work = 0; struct bchannel *bchannel; char buffer[2048+MISDN_HEADER_LEN]; struct mISDNhead *hh = (struct mISDNhead *)buffer; /* process all bchannels */ bchannel = bchannel_first; while(bchannel) { /* handle message from bchannel */ if (bchannel->b_sock > -1) { ret = recv(bchannel->b_sock, buffer, sizeof(buffer), 0); if (ret >= (int)MISDN_HEADER_LEN) { work = 1; switch(hh->prim) { /* we don't care about confirms, we use rx data to sync tx */ case PH_DATA_CNF: break; /* we receive audio data, we respond to it AND we send tones */ case PH_DATA_IND: case PH_DATA_REQ: case DL_DATA_IND: case PH_CONTROL_IND: bchannel_receive(bchannel, buffer, ret-MISDN_HEADER_LEN); break; case PH_ACTIVATE_IND: case DL_ESTABLISH_IND: case PH_ACTIVATE_CNF: case DL_ESTABLISH_CNF: CDEBUG(NULL, NULL, "DL_ESTABLISH confirm: bchannel is now activated (socket %d).\n", bchannel->b_sock); bchannel_activated(bchannel); break; case PH_DEACTIVATE_IND: case DL_RELEASE_IND: case PH_DEACTIVATE_CNF: case DL_RELEASE_CNF: CDEBUG(NULL, NULL, "DL_RELEASE confirm: bchannel is now de-activated (socket %d).\n", bchannel->b_sock); // bchannel_deactivated(bchannel); break; default: CERROR(NULL, NULL, "child message not handled: prim(0x%x) socket(%d) data len(%d)\n", hh->prim, bchannel->b_sock, ret - MISDN_HEADER_LEN); } } else { if (ret < 0 && errno != EWOULDBLOCK) CERROR(NULL, NULL, "Read from socket %d failed with return code %d\n", bchannel->b_sock, ret); } } bchannel = bchannel->next; } /* if we received at least one b-frame, we will return 1 */ return(work); } /* * bchannel channel handling */ struct bchannel *bchannel_first = NULL; struct bchannel *find_bchannel_handle(unsigned long handle) { struct bchannel *bchannel = bchannel_first; while(bchannel) { if (bchannel->handle == handle) break; bchannel = bchannel->next; } return(bchannel); } #if 0 struct bchannel *find_bchannel_ref(unsigned long ref) { struct bchannel *bchannel = bchannel_first; while(bchannel) { if (bchannel->ref == ref) break; bchannel = bchannel->next; } return(bchannel); } #endif struct bchannel *alloc_bchannel(unsigned long handle) { struct bchannel **bchannelp = &bchannel_first; while(*bchannelp) bchannelp = &((*bchannelp)->next); *bchannelp = (struct bchannel *)calloc(1, sizeof(struct bchannel)); if (!*bchannelp) return(NULL); (*bchannelp)->handle = handle; (*bchannelp)->b_state = BSTATE_IDLE; return(*bchannelp); } void free_bchannel(struct bchannel *bchannel) { struct bchannel **temp = &bchannel_first; while(*temp) { if (*temp == bchannel) { *temp = (*temp)->next; if (bchannel->b_sock > -1) bchannel_destroy(bchannel); if (bchannel->call) { if (bchannel->call->bchannel) bchannel->call->bchannel = NULL; } free(bchannel); return; } temp = &((*temp)->next); } }