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Diffstat (limited to 'src/router/call.c')
| -rw-r--r-- | src/router/call.c | 1905 |
1 files changed, 1905 insertions, 0 deletions
diff --git a/src/router/call.c b/src/router/call.c new file mode 100644 index 0000000..9933a2f --- /dev/null +++ b/src/router/call.c @@ -0,0 +1,1905 @@ +/* call handling + * + * (C) 2020 by Andreas Eversberg <jolly@eversberg.eu> + * All Rights Reserved + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +/* Call forking process + * + * A call can be forwarded to one or multiple endpoints (call forking). + * + * In case of call forking, each terminating endpoint that disconnects or + * releases, is removed from the list of terminating endpoints. The cause is + * collected according to mulitpoint process at Q.931. If all endpoints have + * disconnected or released, the originating endpoint is released with the + * collected cause. + * + * If one terminating endpoint answers the call, all other endpoints are + * released with the cause "non-selected user clearing". + * + * If the originating endpoint disconnectes or releases prior answer, all + * terminating endpoints are released with the same cause. + */ + +/* SDP negotiation process + * + * The originating endpoint sends a CC-SETUP-REQ with SDP included. + * + * If no RTP proxy is enabled, the SDP is forwarded towards terminating + * endpoint or multiple terminating endpoints (in case of call forking). The + * first reply with SDP from the terminating endpoint is stored. In case of + * single terminating endpoint, it is forwarded towards the originating + * endpoint with progress indicator set to 1 or 8. In case of multiple + * terminating endpoints (call forking) the SDP is forwarded as soon a + * CC-SETUP-RSP is received from the first terminating endpoint that answers. + * The SDP negotiation is complete. + * + * If RTP proxy is enabled, the SDP is negotiated with the supported codecs of + * this router. The first reply to the CC-SETUP-REQ message will include the + * SDP reply as well as progress indicator set to 8 (if not a CC-SETUP-CNF + * message) towards originating endpoint. The SDP negoatiation on the + * originating side is complete. If the call gets forwarded to a single or + * multiple terminating endpoints, an SDP is generated with teh supported + * codecs of this router. In case of single terminating endpont, the SDP of the + * first reply to the CC-SETUP-IND message is used to negotiate the codec. In + * case of multiple terminating endpoints (call forking) the SDP reply is + * stored and processed when a CC-SETUP-RSP is received from the first + * terminating endpoint that answers. The SDP negotiation on the terminating + * side is complete. + */ + +#include <stdio.h> +#include <unistd.h> +#include <errno.h> +#include <string.h> +#include <stdint.h> +#include <stdlib.h> +#include <math.h> +#include <sys/types.h> +#include <sys/wait.h> +#include "../libdebug/debug.h" +#include "../libg711/g711.h" +#include "call.h" +#include "audio.h" +#include "display.h" + +call_t *call_list = NULL; +struct timer status_timer; +static osmo_cc_endpoint_t *cc_ep; +static const char *routing_script, *routing_shell; + +static struct osmo_cc_helper_audio_codecs codecs[] = { +// { "L16", 8000, 1, encode_l16, decode_l16 }, FIXME: make codecs selectable, if more codecs are supported in the future + { "PCMA", 8000, 1, g711_encode_alaw, g711_decode_alaw }, + { "PCMU", 8000, 1, g711_encode_ulaw, g711_decode_ulaw }, + { NULL, 0, 0, NULL, NULL}, +}; + +static void refresh_status(void) +{ + osmo_cc_call_t *cc_call; + int from_count, to_count; + call_t *call; + call_relation_t *relation; + + display_status_start(); + + for (cc_call = cc_ep->call_list; cc_call; cc_call = cc_call->next) { + if (cc_call->state != OSMO_CC_STATE_ATTACH_IN) + continue; + if (!cc_call->attached_name) + continue; + from_count = 0; + for (call = call_list; call; call = call->next) { + if (!call->relation_list) + continue; + if (!!strcmp(cc_call->attached_name, call->relation_list->interface)) + continue; + to_count = 0; + for (relation = call->relation_list->next; relation; relation = relation->next) { + display_status_line(cc_call->attached_name, from_count, call->relation_list->id, to_count, relation->interface, relation->id, relation->state); + to_count++; + } + if (!to_count) + display_status_line(cc_call->attached_name, from_count, call->relation_list->id, 0, NULL, NULL, 0); + from_count++; + } + if (!from_count) + display_status_line(cc_call->attached_name, 0, NULL, 0, NULL, NULL, 0); + } + + display_status_end(); +} + +static int status_needs_update = 0; + +static void status_timeout(struct timer *timer) +{ + static int last_interfaces = -1; + osmo_cc_call_t *cc_call; + int interfaces = 0; + + for (cc_call = cc_ep->call_list; cc_call; cc_call = cc_call->next) { + if (cc_call->state != OSMO_CC_STATE_ATTACH_IN) + continue; + interfaces++; + } + + if (interfaces != last_interfaces) { + last_interfaces = interfaces; + status_needs_update = 1; + } + + if (status_needs_update) { + refresh_status(); + status_needs_update = 0; + } + + timer_start(timer, 0.1); +} + +static const char *state_names[] = { + "IDLE", + "SETUP", + "OVERLAP", + "PROCEEDING", + "ALERTING", + "CONNECT", + "DISC-FROM-ORIG", + "DISC-FROM-TERM", +}; + +static void new_state(call_t *call, enum call_state state) +{ + PDEBUG(DROUTER, DEBUG_DEBUG, "(call #%d) Changing state %s -> %s.\n", call->num, state_names[call->state], state_names[state]); + call->state = state; +} + +static const char *relation_name(call_relation_t *relation) +{ + static char text[128]; + + if (relation->num == 0) + sprintf(text, "(call #%d, originator)", relation->call->num); + else + sprintf(text, "(call #%d, terminator #%d)", relation->call->num, relation->num); + + return text; +} + +static call_t *call_create(void) +{ + call_t *call, **call_p; + static int call_num = 0; + + call = calloc(1, sizeof(*call)); + if (!call) { + PDEBUG(DROUTER, DEBUG_ERROR, "No memory!\n"); + abort(); + } + + call->num = ++call_num; + call->routing.call = call; + + /* append to list */ + call_p = &call_list; + while (*call_p) + call_p = &((*call_p)->next); + *call_p = call; + + PDEBUG(DROUTER, DEBUG_DEBUG, "(call #%d) Created new call instance.\n", call->num); + + return call; +} + +static void relation_destroy(call_relation_t *relation); + +static void call_destroy(call_t *call) +{ + call_t **call_p; + + new_state(call, CALL_STATE_IDLE); + + /* remove setup message */ + free(call->setup_msg); + + /* destroy all relations */ + while (call->relation_list) + relation_destroy(call->relation_list); + + /* destroy routing */ + routing_stop(&call->routing); + routing_env_free(&call->routing); + + /* detach */ + call_p = &call_list; + while (*call_p) { + if (*call_p == call) + break; + call_p = &((*call_p)->next); + } + *call_p = call->next; + + PDEBUG(DROUTER, DEBUG_DEBUG, "(call #%d) Destroyed call instance.\n", call->num); + + free(call); +} + +static call_relation_t *relation_create(call_t *call) +{ + call_relation_t *relation, **relation_p; + int rc; + + relation = calloc(1, sizeof(*relation)); + if (!relation) { + PDEBUG(DROUTER, DEBUG_ERROR, "No memory!\n"); + abort(); + } + + relation->call = call; + + /* allocate jitter buffer */ + rc = jitter_create(&relation->orig_dejitter, 8000 / 10); // FIXME: size + if (rc < 0) + abort(); + rc = jitter_create(&relation->term_dejitter, 8000 / 10); // FIXME: size + if (rc < 0) + abort(); + + /* append to list, count number of relation */ + relation_p = &call->relation_list; + while (*relation_p) { + relation->num++; + relation_p = &((*relation_p)->next); + } + *relation_p = relation; + + PDEBUG(DROUTER, DEBUG_DEBUG, "%s Created new endpoint relation instance.\n", relation_name(relation)); + + return relation; +} + +static void relation_destroy(call_relation_t *relation) +{ + call_relation_t **relation_p; + + /* playback and record */ + wave_destroy_playback(&relation->play); + wave_destroy_record(&relation->rec); + + /* dtmf decoder */ + dtmf_decode_exit(&relation->dtmf_dec); + + /* SDP */ + free((char *)relation->sdp); + + /* session */ + if (relation->cc_session) { + osmo_cc_free_session(relation->cc_session); + relation->cc_session = NULL; + } + + /* destroy jitter buffer */ + jitter_destroy(&relation->orig_dejitter); + jitter_destroy(&relation->term_dejitter); + + /* detach */ + relation_p = &relation->call->relation_list; + while (*relation_p) { + if (*relation_p == relation) + break; + relation_p = &((*relation_p)->next); + } + *relation_p = relation->next; + + PDEBUG(DROUTER, DEBUG_DEBUG, "%s Destroyed endpoint relation instance.\n", relation_name(relation)); + + free(relation); + + /* refresh status: we lost a call (originating and/or terminating) */ + status_needs_update = 1; +} + +int call_init(osmo_cc_endpoint_t *ep, const char *_routing_script, const char *_routing_shell) +{ + cc_ep = ep; + routing_script = _routing_script; + routing_shell = _routing_shell; + timer_init(&status_timer, status_timeout, NULL); + status_timeout(&status_timer); + return 0; +} + +void call_exit(void) +{ + timer_exit(&status_timer); + + /* destroy all calls */ + while (call_list) + call_destroy(call_list); +} + +/* handle all calls, if it returns 1, work has been done, so it must be called again */ +int call_handle(void) +{ + int w; + call_t *call; + int status; + pid_t pid; + + for (call = call_list; call; call = call->next) { + /* must return, call may be destroyed */ + w = routing_handle(&call->routing); + if (w) + return 1; + } + + /* eat zombies */ + while ((pid = waitpid(-1, &status, WNOHANG)) > 0) { + PDEBUG(DROUTER, DEBUG_DEBUG, "Script child %d terminated.\n", pid); + for (call = call_list; call; call = call->next) { + if (call->routing.script_pid == pid) { + /* tell routing that script has terminated */ + call->routing.script_pid = 0; + } + } + } + + return 0; +} + +/* + * RTP-Proxy + */ + +/* send SDP answer to originator */ +static void proxy_send_sdp_answer(call_relation_t *relation, osmo_cc_msg_t *msg) +{ + const char *sdp; + + /* no proxy */ + if (!relation->rtp_proxy) + return; + + /* NOTE: The SDP was removed at cc_message() */ + + /* add progreess if not connect message, but for first message or disconnect message */ + if (msg->type != OSMO_CC_MSG_SETUP_CNF + && (msg->type == OSMO_CC_MSG_DISC_IND || !relation->codec_negotiated)) { + /* process */ + PDEBUG(DROUTER, DEBUG_DEBUG, "Sending progress indicator 8 to allow audio.\n"); + osmo_cc_add_ie_progress(msg, OSMO_CC_CODING_ITU_T, OSMO_CC_LOCATION_BEYOND_INTERWORKING, OSMO_CC_PROGRESS_INBAND_INFO_AVAILABLE); + } + +// if (!relation->codec_negotiated || msg->type == OSMO_CC_MSG_SETUP_CNF) { gibt einen crash, da codec vor der antwort schon gesetzt ist. warum sollten wir nach einer antwort denn nochmal den codec schicken? + if (!relation->codec_negotiated) { + sdp = osmo_cc_helper_audio_accept(relation, codecs, receive_originator, relation->call->setup_msg, &relation->cc_session, &relation->codec, 0); + if (sdp) { + relation->codec_negotiated = 1; + PDEBUG(DROUTER, DEBUG_DEBUG, "Sending SDP answer to originator with supported codecs.\n"); + /* SDP */ + osmo_cc_add_ie_sdp(msg, sdp); + } else { + relation->rtp_proxy = 0; + PDEBUG(DROUTER, DEBUG_ERROR, "Originator's setup message does not contain a codec we support, cannot use RTP-Proxy!\n"); + } + } +} + +/* + * process call from originator + */ + +/* a new call is received */ +static void orig_setup(uint32_t callref, osmo_cc_msg_t *old_msg) +{ + call_t *call; + call_relation_t *relation; + char sdp[65536]; + uint8_t type, plan, present, screen; + char number[256]; + int rc; + + /* creating call instance, transparent until setup with hdlc */ + call = call_create(); + if (!call) { + PDEBUG(DROUTER, DEBUG_ERROR, "Cannot create calll instance.\n"); + abort(); + } + relation = relation_create(call); + /* link with cc */ + relation->cc_callref = callref; + + PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-SETUP-REQ from originator.\n", relation_name(relation)); + + /* store setup message in call structure */ + call->setup_msg = osmo_cc_clone_msg(old_msg); + + /* store SDP */ + rc = osmo_cc_get_ie_sdp(old_msg, 0, sdp, sizeof(sdp)); + if (rc >= 0) { + free((char *)relation->sdp); + relation->sdp = strdup(sdp); + } + + /* store called number */ + rc = osmo_cc_get_ie_called(old_msg, 0, &type, &plan, number, sizeof(number)); + if (rc >= 0 && number[0]) { + /* add number to current dial string */ + if (strlen(number) < sizeof(call->dialing_number)) + strcpy(call->dialing_number, number); + } + + /* store keypad */ + rc = osmo_cc_get_ie_keypad(old_msg, 0, number, sizeof(number)); + if (rc >= 0 && number[0]) { + /* add number to current dial string */ + if (strlen(number) < sizeof(call->dialing_keypad)) + strcpy(call->dialing_keypad, number); + } + + /* store peer info for status */ + rc = osmo_cc_get_ie_calling_interface(old_msg, 0, relation->interface, sizeof(relation->interface)); + rc = osmo_cc_get_ie_calling(old_msg, 0, &type, &plan, &present, &screen, relation->id, sizeof(relation->id)); + + /* apply environment for routing */ + routing_env_msg(&call->routing, old_msg); + + /* start routing script */ + routing_start(&call->routing, routing_script, routing_shell); + + /* go into setup state and return */ + new_state(call, CALL_STATE_SETUP); + + /* refresh status: we have originating call */ + status_needs_update = 1; + + return; +} + +/* information (dialing) is received from originating side */ +static void orig_info(call_t *call, osmo_cc_msg_t *old_msg) +{ + uint8_t type, plan; + char number[256]; + char keypad[256]; + uint8_t duration_ms, pause_ms, dtmf_mode; + char dtmf[256]; + char command[512]; + int rc; + osmo_cc_msg_t *new_msg; + + PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-INFO-REQ from originator.\n", relation_name(call->relation_list)); + + /* add called number to dial string */ + rc = osmo_cc_get_ie_called(old_msg, 0, &type, &plan, number, sizeof(number)); + if (rc < 0) + number[0] = '\0'; + if (number[0]) { + /* add number to current dial string */ + if (strlen(number) < sizeof(call->dialing_number) - strlen(call->dialing_number)) + strcat(call->dialing_number, number); + } + + /* add keypad to dial string */ + rc = osmo_cc_get_ie_keypad(old_msg, 0, keypad, sizeof(keypad)); + if (rc < 0) + keypad[0] = '\0'; + if (keypad[0]) { + /* add number to current dial string */ + if (strlen(keypad) < sizeof(call->dialing_keypad) - strlen(call->dialing_keypad)) + strcat(call->dialing_keypad, keypad); + } + + /* dtmf digits */ + rc = osmo_cc_get_ie_dtmf(old_msg, 0, &duration_ms, &pause_ms, &dtmf_mode, dtmf, sizeof(dtmf)); + if (rc < 0 || (dtmf_mode != OSMO_CC_DTMF_MODE_ON && dtmf_mode != OSMO_CC_DTMF_MODE_DIGITS)) + dtmf[0] = '\0'; + + /* if there is only one call relation, forward that message */ + if (call->relation_list->next && !call->relation_list->next->next) { + /* concat number to id of relation */ + if (strlen(call->relation_list->next->id) + strlen(number) < sizeof(call->relation_list->next->id)) + strcat(call->relation_list->next->id, number); + new_msg = osmo_cc_clone_msg(old_msg); + new_msg->type = OSMO_CC_MSG_INFO_IND; + osmo_cc_ll_msg(cc_ep, call->relation_list->next->cc_callref, new_msg); + return; + } + + /* if there is no call in overlap state, perform routing */ + if (call->state == CALL_STATE_OVERLAP && !call->relation_list->next) { + if (!call->routing.routing) { + /* restart routing with new dial string */ + routing_env_dialing(&call->routing, call->dialing_number, call->dialing_keypad); + routing_start(&call->routing, routing_script, routing_shell); + } else { + /* send digits to routing */ + if (number[0]) { + snprintf(command, sizeof(command) - 1, "dialing %s", number); + command[sizeof(command) - 1] = '\0'; + routing_send(&call->routing, command); + } + if (keypad[0]) { + snprintf(command, sizeof(command) - 1, "keypad %s", keypad); + command[sizeof(command) - 1] = '\0'; + routing_send(&call->routing, command); + } + } + } + + /* send dtmf, to routing in all other states */ + if (!call->relation_list->next) { + if (call->routing.routing) { + if (dtmf[0]) { + snprintf(command, sizeof(command) - 1, "dtmf %s", dtmf); + command[sizeof(command) - 1] = '\0'; + routing_send(&call->routing, command); + } + } + } +} + +/* disconnect is received from originating side */ +static void orig_disc(call_t *call, osmo_cc_msg_t *old_msg) +{ + osmo_cc_msg_t *new_msg; + call_relation_t *relation; + + PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-DISC-REQ from originator.\n", relation_name(call->relation_list)); + + /* stop routing, if originator hangs up */ + if (call->routing.routing) { + routing_stop(&call->routing); + } + + /* if there is no terminating call, release originator and destroy call */ + if (!call->relation_list->next) { + new_msg = osmo_cc_clone_msg(old_msg); + new_msg->type = OSMO_CC_MSG_REL_IND; + osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg); + /* destroy call */ + call_destroy(call); + return; + } + + /* if there is one terminating call, forward the disc message */ + if (!call->relation_list->next->next) { + /* update call state for status display */ + call->relation_list->next->state = CALL_STATE_DISC_FROM_TERM; + status_needs_update = 1; + /* forward disc message */ + new_msg = osmo_cc_clone_msg(old_msg); + new_msg->type = OSMO_CC_MSG_DISC_IND; + osmo_cc_ll_msg(cc_ep, call->relation_list->next->cc_callref, new_msg); + new_state(call, CALL_STATE_DISC_FROM_ORIG); + return; + } + + /* if there are multiple terminating calls, release them and originator and destroy call */ + for (relation = call->relation_list->next; relation; relation = relation->next) { + new_msg = osmo_cc_clone_msg(old_msg); + new_msg->type = OSMO_CC_MSG_REL_IND; + osmo_cc_ll_msg(cc_ep, relation->cc_callref, new_msg); + } + new_msg = osmo_cc_clone_msg(old_msg); + new_msg->type = OSMO_CC_MSG_REL_IND; + osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg); + /* destroy call */ + call_destroy(call); +} + +/* release is received from originating side */ +static void orig_rel(call_t *call, osmo_cc_msg_t *old_msg) +{ + osmo_cc_msg_t *new_msg; + call_relation_t *relation; + + PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-REL-REQ from originator.\n", relation_name(call->relation_list)); + + /* stop routing, if originator hangs up */ + if (call->routing.routing) { + routing_stop(&call->routing); + } + + /* release all terminating calls, if any and confirm originator and destroy call */ + for (relation = call->relation_list->next; relation; relation = relation->next) { + new_msg = osmo_cc_clone_msg(old_msg); + new_msg->type = OSMO_CC_MSG_REL_IND; + osmo_cc_ll_msg(cc_ep, relation->cc_callref, new_msg); + } + new_msg = osmo_cc_clone_msg(old_msg); + new_msg->type = OSMO_CC_MSG_REL_CNF; + osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg); + /* destroy call */ + call_destroy(call); +} + +/* other message is received from originating side */ +static void orig_other(call_t *call, osmo_cc_msg_t *old_msg) +{ + osmo_cc_msg_t *new_msg; + + PDEBUG(DROUTER, DEBUG_DEBUG, "%s Other CC message from originator.\n", relation_name(call->relation_list)); + + /* if there is one terminating call, forward the message */ + if (call->relation_list->next && !call->forking) { + new_msg = osmo_cc_clone_msg(old_msg); + new_msg->type = old_msg->type | 1; /* convert REQ->IND, RSP->CNF */ + osmo_cc_ll_msg(cc_ep, call->relation_list->next->cc_callref, new_msg); + return; + } +} + +/* + * process call from terminator + */ + +/* overlap dialing is received from terminating side */ +static void term_progress(call_t *call, call_relation_t *relation, osmo_cc_msg_t *old_msg) +{ + osmo_cc_msg_t *new_msg; + + PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-PROGRESS-REQ from terminator.\n", relation_name(relation)); + + /* if single call exists, forward progress to originator */ + if (!call->forking) { + /* forward message to originator */ + new_msg = osmo_cc_clone_msg(old_msg); + new_msg->type = OSMO_CC_MSG_PROGRESS_IND; + /* send SDP answer */ + proxy_send_sdp_answer(call->relation_list, new_msg); + osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg); + } +} + +/* overlap dialing is received from terminating side */ +static void term_overlap(call_t *call, call_relation_t *relation, osmo_cc_msg_t *old_msg) +{ + osmo_cc_msg_t *new_msg; + + PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-SETUP-ACK-REQ from terminator.\n", relation_name(relation)); + + /* update call state for status display */ + relation->state = CALL_STATE_OVERLAP; + status_needs_update = 1; + + /* notify routing */ + if (call->routing.routing) + routing_send(&call->routing, "call-overlap"); + + /* if we already reached/passed that state, we ignore it */ + if (call->state != CALL_STATE_SETUP) + return; + + /* change state */ + new_state(call, CALL_STATE_OVERLAP); + + if (!call->forking) { + /* forward message to originator */ + new_msg = osmo_cc_clone_msg(old_msg); + new_msg->type = OSMO_CC_MSG_SETUP_ACK_IND; + } else { + /* send message to originator */ + new_msg = osmo_cc_new_msg(OSMO_CC_MSG_SETUP_ACK_IND); + } + /* send SDP answer */ + proxy_send_sdp_answer(call->relation_list, new_msg); + osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg); +} + +/* proceeding is received from terminating side */ +static void term_proc(call_t *call, call_relation_t *relation, osmo_cc_msg_t *old_msg) +{ + osmo_cc_msg_t *new_msg; + + PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-PROC-REQ from terminator.\n", relation_name(relation)); + + /* update call state for status display */ + relation->state = CALL_STATE_PROCEEDING; + status_needs_update = 1; + + /* notify routing */ + if (call->routing.routing) + routing_send(&call->routing, "call-proceeding"); + + /* if we already reached/passed that state, we ignore it */ + if (call->state != CALL_STATE_SETUP + && call->state != CALL_STATE_OVERLAP) + return; + + /* change state */ + new_state(call, CALL_STATE_PROCEEDING); + + if (!call->forking) { + /* forward message to originator */ + new_msg = osmo_cc_clone_msg(old_msg); + new_msg->type = OSMO_CC_MSG_PROC_IND; + } else { + /* send message to originator */ + new_msg = osmo_cc_new_msg(OSMO_CC_MSG_PROC_IND); + } + /* send SDP answer */ + proxy_send_sdp_answer(call->relation_list, new_msg); + osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg); +} + +/* alerting is received from terminating side */ +static void term_alert(call_t *call, call_relation_t *relation, osmo_cc_msg_t *old_msg) +{ + osmo_cc_msg_t *new_msg; + + PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-ALERT-REQ from terminator.\n", relation_name(relation)); + + /* update call state for status display */ + relation->state = CALL_STATE_ALERTING; + status_needs_update = 1; + + /* notify routing */ + if (call->routing.routing) + routing_send(&call->routing, "call-alerting"); + + /* if we already reached/passed that state, we ignore it */ + if (call->state != CALL_STATE_SETUP + && call->state != CALL_STATE_OVERLAP + && call->state != CALL_STATE_PROCEEDING) + return; + + /* change state */ + new_state(call, CALL_STATE_ALERTING); + + if (!call->forking) { + /* forward message to originator */ + new_msg = osmo_cc_clone_msg(old_msg); + new_msg->type = OSMO_CC_MSG_ALERT_IND; + } else { + /* send message to originator */ + new_msg = osmo_cc_new_msg(OSMO_CC_MSG_ALERT_IND); + } + /* send SDP answer */ + proxy_send_sdp_answer(call->relation_list, new_msg); + osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg); +} + +/* connect is received from terminating side */ +static void term_connect(call_t *call, call_relation_t *relation, osmo_cc_msg_t *old_msg) +{ + osmo_cc_msg_t *new_msg; + char sdp[65536]; + int rc; + + PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-SETUP-RSP (connect) from terminator.\n", relation_name(relation)); + + /* update call state for status display */ + relation->state = CALL_STATE_CONNECT; + status_needs_update = 1; + + /* notify routing */ + if (call->routing.routing) + routing_send(&call->routing, "call-answer"); + + /* if we already reached/passed that state, we ignore it */ + if (call->state != CALL_STATE_SETUP + && call->state != CALL_STATE_OVERLAP + && call->state != CALL_STATE_PROCEEDING + && call->state != CALL_STATE_ALERTING) { + PDEBUG(DROUTER, DEBUG_ERROR, "Connect message from terminating call now allowed in state '%s'.\n", state_names[call->state]); + return; + } + + /* change state */ + new_state(call, CALL_STATE_CONNECT); + + /* release all other relations with "non-selected user clearing" */ + while (call->relation_list->next->next) { + call_relation_t *other; + /* select other terminating call (not the one that answered) */ + if (call->relation_list->next == relation) + other = call->relation_list->next->next; + else + other = call->relation_list->next; + PDEBUG(DROUTER, DEBUG_DEBUG, "Sending 'non-selected user clearing' to other terminator.\n"); + /* send release message */ + new_msg = osmo_cc_new_msg(OSMO_CC_MSG_REL_IND); + osmo_cc_add_ie_cause(new_msg, cc_ep->serving_location, OSMO_CC_ISDN_CAUSE_NONSE_USER_CLR, 0, 0); + osmo_cc_ll_msg(cc_ep, other->cc_callref, new_msg); + /* destroy terminating relation */ + relation_destroy(other); + } + + /* call is not forking anymore */ + call->forking = 0; + + rc = osmo_cc_get_ie_sdp(old_msg, 0, sdp, sizeof(sdp)); + if (rc < 0) + sdp[0] = '\0'; + + /* forward message to originator */ + new_msg = osmo_cc_clone_msg(old_msg); + new_msg->type = OSMO_CC_MSG_SETUP_CNF; + /* only if RTP-Proxy is used */ + if (call->relation_list->rtp_proxy) { + /* send SDP answer */ + proxy_send_sdp_answer(call->relation_list, new_msg); + } else + /* use earlier SDP if not included */ + if (!sdp[0] && relation->sdp) + osmo_cc_add_ie_sdp(new_msg, relation->sdp); + osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg); +} + +/* disconnect is received from terminating side */ +static void term_disc(call_t *call, call_relation_t *relation, osmo_cc_msg_t *old_msg) +{ + osmo_cc_msg_t *new_msg; + + PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-DISC-REQ from terminator.\n", relation_name(relation)); + + /* update call state for status display */ + relation->state = CALL_STATE_DISC_FROM_TERM; + status_needs_update = 1; + + /* if we have not yet connected a call */ + if (call->state == CALL_STATE_SETUP + || call->state == CALL_STATE_OVERLAP + || call->state == CALL_STATE_PROCEEDING + || call->state == CALL_STATE_ALERTING) { + uint8_t location, isdn_cause, socket_cause; + uint16_t sip_cause; + int rc; + + PDEBUG(DROUTER, DEBUG_DEBUG, "Got a disconnect before connect.\n"); + /* if there is only one terminating call, forward that disconnect */ + if (!call->forking) { + PDEBUG(DROUTER, DEBUG_DEBUG, "Call is not forking, so we directly forward this disconnect.\n"); + /* notify routing */ + if (call->routing.routing) + routing_send(&call->routing, "call-disconnect"); + /* change state */ + new_state(call, CALL_STATE_DISC_FROM_TERM); + /* forward message to originator */ + new_msg = osmo_cc_clone_msg(old_msg); + new_msg->type = OSMO_CC_MSG_DISC_IND; + /* send SDP answer */ + proxy_send_sdp_answer(call->relation_list, new_msg); + osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg); + return; + } + + /* collect cause */ + PDEBUG(DROUTER, DEBUG_DEBUG, "Call is forking, so we collect ISDN cause and destroy relation.\n"); + rc = osmo_cc_get_ie_cause(old_msg, 0, &location, &isdn_cause, &sip_cause, &socket_cause); + if (rc >= 0) + call->collect_cause = osmo_cc_collect_cause(call->collect_cause, isdn_cause); + + /* release the terminator */ + new_msg = osmo_cc_clone_msg(old_msg); + new_msg->type = OSMO_CC_MSG_REL_IND; + osmo_cc_ll_msg(cc_ep, relation->cc_callref, new_msg); + + /* remove relation */ + relation_destroy(relation); + + /* if all terminating calls have been released, release the originator and destroy call */ + if (!call->relation_list->next) { + PDEBUG(DROUTER, DEBUG_DEBUG, "All terminators have disconnected, so we forward a release with the collected cause.\n"); + new_msg = osmo_cc_new_msg(OSMO_CC_MSG_REL_IND); + osmo_cc_add_ie_cause(new_msg, cc_ep->serving_location, call->collect_cause, 0, 0); + osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg); + /* destroy call */ + call_destroy(call); + } + return; + } + + /* this is connect or disconnect collision. the state implies that there is only one terminating call */ + if (call->state == CALL_STATE_CONNECT + || call->state == CALL_STATE_DISC_FROM_ORIG) { + PDEBUG(DROUTER, DEBUG_DEBUG, "Got a disconnect after connect, so we directly forward this disconnect.\n"); + new_msg = osmo_cc_clone_msg(old_msg); + new_msg->type = OSMO_CC_MSG_REL_IND; + osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg); + new_msg = osmo_cc_clone_msg(old_msg); + new_msg->type = OSMO_CC_MSG_REL_IND; + osmo_cc_ll_msg(cc_ep, relation->cc_callref, new_msg); + /* destroy call */ + call_destroy(call); + return; + } + + PDEBUG(DROUTER, DEBUG_ERROR, "Disconnect message from terminating call now allowed in state '%s'.\n", state_names[call->state]); +} + +/* rel is received from terminating side */ +static void term_rel(call_t *call, call_relation_t *relation, osmo_cc_msg_t *old_msg) +{ + osmo_cc_msg_t *new_msg; + + PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-REL-REQ from terminator.\n", relation_name(relation)); + + /* if we have not yet connected a call */ + if (call->state == CALL_STATE_SETUP + || call->state == CALL_STATE_OVERLAP + || call->state == CALL_STATE_PROCEEDING + || call->state == CALL_STATE_ALERTING) { + uint8_t location, isdn_cause, socket_cause; + uint16_t sip_cause; + int rc; + + PDEBUG(DROUTER, DEBUG_DEBUG, "Got a release before connect.\n"); + /* if there is only one terminating call, forward that disconnect */ + if (!call->forking) { + PDEBUG(DROUTER, DEBUG_DEBUG, "Call is not forking, so we directly forward this release.\n"); + /* forward message to originator */ + new_msg = osmo_cc_clone_msg(old_msg); + new_msg->type = OSMO_CC_MSG_REL_IND; + osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg); + /* confirm to terminator */ + new_msg = osmo_cc_clone_msg(old_msg); + new_msg->type = OSMO_CC_MSG_REL_CNF; + osmo_cc_ll_msg(cc_ep, relation->cc_callref, new_msg); + /* destroy call */ + call_destroy(call); + return; + } + + /* collect cause */ + PDEBUG(DROUTER, DEBUG_DEBUG, "Call is forking, so we collect ISDN cause and destroy relation.\n"); + rc = osmo_cc_get_ie_cause(old_msg, 0, &location, &isdn_cause, &sip_cause, &socket_cause); + if (rc >= 0) + call->collect_cause = osmo_cc_collect_cause(call->collect_cause, isdn_cause); + + /* confirm the terminator */ + new_msg = osmo_cc_clone_msg(old_msg); + new_msg->type = OSMO_CC_MSG_REL_CNF; + osmo_cc_ll_msg(cc_ep, relation->cc_callref, new_msg); + + /* remove relation */ + relation_destroy(relation); + + /* if all terminating calls have been released, release the originator and destroy call */ + if (!call->relation_list->next) { + PDEBUG(DROUTER, DEBUG_DEBUG, "All terminators have released, so we forward it with the collected cause.\n"); + new_msg = osmo_cc_new_msg(OSMO_CC_MSG_REL_IND); + osmo_cc_add_ie_cause(new_msg, cc_ep->serving_location, call->collect_cause, 0, 0); + osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg); + /* destroy call */ + call_destroy(call); + } + return; + } + + /* forward release to originator and confirm to terminator. the state implies that there is only one terminating call */ + if (call->state == CALL_STATE_CONNECT + || call->state == CALL_STATE_DISC_FROM_ORIG) { + PDEBUG(DROUTER, DEBUG_DEBUG, "Got a release after connect, so we directly forward this release.\n"); + new_msg = osmo_cc_clone_msg(old_msg); + new_msg->type = OSMO_CC_MSG_REL_IND; + osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg); + new_msg = osmo_cc_clone_msg(old_msg); + new_msg->type = OSMO_CC_MSG_REL_CNF; + osmo_cc_ll_msg(cc_ep, relation->cc_callref, new_msg); + /* destroy call */ + call_destroy(call); + return; + } + + PDEBUG(DROUTER, DEBUG_ERROR, "Release message from terminating call now allowed in state '%s'.\n", state_names[call->state]); +} + +/* other message is received from terminating side */ +static void term_other(call_t *call, call_relation_t *relation, osmo_cc_msg_t *old_msg) +{ + osmo_cc_msg_t *new_msg; + + PDEBUG(DROUTER, DEBUG_DEBUG, "%s Other CC message from terminator.\n", relation_name(relation)); + + /* if there is one terminating call, forward the message */ + if (!call->relation_list->next->next) { + new_msg = osmo_cc_clone_msg(old_msg); + new_msg->type = old_msg->type | 1; /* convert REQ->IND, RSP->CNF */ + osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg); + return; + } +} + +/* handle message from upper layer */ +void cc_message(osmo_cc_endpoint_t __attribute__((unused)) *ep, uint32_t callref, osmo_cc_msg_t *msg) +{ + call_t *call; + call_relation_t *relation; + char sdp[65536]; + int rc_sdp; + + /* hunt for callref */ + call = call_list; + while (call) { + relation = call->relation_list; + while (relation) { + if (relation->cc_callref == callref) + break; + relation = relation->next; + } + if (relation) + break; + call = call->next; + } + + /* process SETUP (new call) */ + if (!call) { + if (msg->type != OSMO_CC_MSG_SETUP_REQ) { + PDEBUG(DROUTER, DEBUG_ERROR, "Received message without call instance, please fix!\n"); + return; + } + orig_setup(callref, msg); + osmo_cc_free_msg(msg); + return; + } + + if (call->relation_list == relation) { + /* handle messages from caller */ + switch (msg->type) { + case OSMO_CC_MSG_INFO_REQ: + orig_info(call, msg); + break; + case OSMO_CC_MSG_DISC_REQ: + orig_disc(call, msg); + break; + case OSMO_CC_MSG_REL_REQ: + orig_rel(call, msg); + break; + default: + orig_other(call, msg); + } + } else { + /* store sdp, if present */ + rc_sdp = osmo_cc_get_ie_sdp(msg, 0, sdp, sizeof(sdp)); + if (rc_sdp >= 0) { + free((char *)relation->sdp); + relation->sdp = strdup(sdp); + } + /* negotiate codec if RTP-Proxy is used and not already negotiated */ + if (call->relation_list->rtp_proxy && relation->cc_session && !relation->codec_negotiated) { + /* remove progress, since it will be added with the SDP answer */ + osmo_cc_remove_ie(msg, OSMO_CC_IE_PROGRESS, 0); + /* negotiate codec */ + osmo_cc_helper_audio_negotiate(msg, &relation->cc_session, &relation->codec); + if (relation->codec) + relation->codec_negotiated = 1; + } + /* remove SDP, if we do RTP-Proxy */ + if (rc_sdp >= 0 && call->relation_list->rtp_proxy) + osmo_cc_remove_ie(msg, OSMO_CC_IE_SDP, 0); + /* handle messages from called */ + switch (msg->type) { + case OSMO_CC_MSG_PROGRESS_IND: + term_progress(call, relation, msg); + break; + case OSMO_CC_MSG_SETUP_ACK_REQ: + term_overlap(call, relation, msg); + break; + case OSMO_CC_MSG_PROC_REQ: + term_proc(call, relation, msg); + break; + case OSMO_CC_MSG_ALERT_REQ: + term_alert(call, relation, msg); + break; + case OSMO_CC_MSG_SETUP_RSP: + term_connect(call, relation, msg); + break; + case OSMO_CC_MSG_DISC_REQ: + term_disc(call, relation, msg); + break; + case OSMO_CC_MSG_REL_REQ: + case OSMO_CC_MSG_REJ_REQ: + term_rel(call, relation, msg); + break; + default: + term_other(call, relation, msg); + } + } + + osmo_cc_free_msg(msg); +} + +/* + * process message from routing + */ + +static const char *value_of_param(const char *arg, const char *param, const char **value_p) +{ + if (!!strncmp(arg, param, strlen(param))) + return NULL; + arg += strlen(param); + + if (*arg == '\0') { + if (value_p) + *value_p = ""; + return ""; + } + + if (*arg != '=') + return NULL; + arg++; + + if (value_p) + *value_p = arg; + return arg; +} + +/* routing orders us to activate rtp proxy */ +static void routing_rtp_proxy(call_t *call) +{ + call_relation_t *relation = call->relation_list; + + /* ignore, if already enabled */ + if (relation->rtp_proxy) { + PDEBUG(DROUTER, DEBUG_NOTICE, "RTP proxy is already enabled!.\n"); + return; + } + + /* error, if we already negotiated */ + if (call->sdp_forwarded) { + PDEBUG(DROUTER, DEBUG_ERROR, "RTP-Proxy cannot be enabled now, because we already forwarded a call.\n"); + return; + } + + /* no SDP */ + if (!relation->sdp) { + PDEBUG(DROUTER, DEBUG_ERROR, "Originator's setup message does not contain SDP, please fix!.\n"); + return; + } + + relation->rtp_proxy = 1; +} + +/* routing orders us to play a wave file */ +static void routing_play(call_t *call, int argc, const char *argv[]) +{ + call_relation_t *relation = call->relation_list; + const char *filename = NULL, *volume = "1.0", *loop = NULL; + int i; + int samplerate = 8000, channels = 0; + double deviation; + int rc; + + wave_destroy_playback(&relation->play); + + if (!relation->rtp_proxy) { + PDEBUG(DROUTER, DEBUG_ERROR, "RTP-Proxy must be enabled to play a file!.\n"); + return; + } + + /* loop through all arguments and stop if there is a ':' */ + for (i = 0; i < argc ; i++) { + if (value_of_param(argv[i], "volume", &volume)); + else if (value_of_param(argv[i], "loop", &loop)); + else { + if (filename) { + PDEBUG(DROUTER, DEBUG_ERROR, "'play' command reqires only one file name, you specified '%s' and '%s'.\n", filename, argv[i]); + return; + } + filename = argv[i]; + } + } + + if (!filename) { + PDEBUG(DROUTER, DEBUG_ERROR, "'play' command reqires a file name as parameter.\n"); + return; + } + + deviation = 1.0 / SPEECH_LEVEL * atof(volume); + rc = wave_create_playback(&relation->play, filename, &samplerate, &channels, deviation); + if (rc < 0) + return; + strncpy(relation->play_filename, filename, sizeof(relation->play_filename) - 1); + relation->play_deviation = deviation; + + + if (channels != 1 && channels != 2) { + wave_destroy_playback(&relation->play); + PDEBUG(DROUTER, DEBUG_ERROR, "'play' command reqires a wave file that has 1 or 2 channels only.\n"); + return; + } + + if (loop) + relation->play_loop = 1; +} + +/* routing orders us stop playing a wave file */ +static void routing_play_stop(call_t *call) +{ + call_relation_t *relation = call->relation_list; + + wave_destroy_playback(&relation->play); +} + +/* routing orders us to record a wave file */ +static void routing_record(call_t *call, int argc, const char *argv[]) +{ + call_relation_t *relation = call->relation_list; + const char *filename = NULL, *volume = "1.0"; + int i; + int samplerate = 8000, channels = 2; + int rc; + + wave_destroy_record(&relation->rec); + + if (!relation->rtp_proxy) { + PDEBUG(DROUTER, DEBUG_ERROR, "RTP-Proxy must be enabled to record a file!.\n"); + return; + } + + /* loop through all arguments and stop if there is a ':' */ + for (i = 0; i < argc ; i++) { + if (value_of_param(argv[i], "volume", &volume)); + else { + if (filename) { + PDEBUG(DROUTER, DEBUG_ERROR, "'record' command reqires only one file name, you specified '%s' and '%s'.\n", filename, argv[i]); + return; + } + filename = argv[i]; + } + } + + if (!filename) { + PDEBUG(DROUTER, DEBUG_ERROR, "'record' command reqires a file name as parameter.\n"); + return; + } + + rc = wave_create_record(&relation->rec, filename, samplerate, channels, 1.0 / SPEECH_LEVEL / atof(volume)); + if (rc < 0) + return; +} + +/* routing orders us stop recording a wave file */ +static void routing_record_stop(call_t *call) +{ + call_relation_t *relation = call->relation_list; + + wave_destroy_record(&relation->rec); +} + +/* routing orders us to set local gain */ +static void routing_gain(call_t *call, int argc, const char *argv[], int tx) +{ + int i; + const char *gain = NULL; + + if (!call->relation_list->rtp_proxy) { + PDEBUG(DROUTER, DEBUG_ERROR, "RTP-Proxy must be enabled to record a file!\n"); + return; + } + + /* loop through all arguments and stop if there is a ':' */ + for (i = 0; i < argc ; i++) { + if (gain) { + PDEBUG(DROUTER, DEBUG_ERROR, "'%s-gain' command reqires only parameter, you specified '%s' and '%s'.\n", (tx) ? "tx" : "rx", gain, argv[i]); + return; + } + gain = argv[i]; + } + + if (!gain) { + PDEBUG(DROUTER, DEBUG_ERROR, "'%s-gain' command reqires a gain value as parameter.\n", (tx) ? "tx" : "rx"); + return; + } + + if (tx) + call->tx_gain = atof(gain); + else + call->rx_gain = atof(gain); + +} + +/* routing orders us to call remote end */ +static void routing_call(call_t *call, int argc, const char *argv[]) +{ + const char *interface; + const char *bearer_coding, *bearer_capability, *bearer_mode; + const char *calling, *calling_type, *calling_plan, *calling_present, *calling_screen, *no_calling; + const char *calling2, *calling2_type, *calling2_plan, *calling2_present, *calling2_screen, *no_calling2; + const char *redirecting, *redirecting_type, *redirecting_plan, *redirecting_present, *redirecting_screen, *redirecting_reason, *no_redirecting; + const char *dialing, *dialing_type, *dialing_plan; + const char *keypad; + uint8_t coding, capability, mode; + uint8_t type, plan, present, screen, reason; + char number[256]; + int i, rc, calls = 0; + osmo_cc_msg_t *new_msg, *setup_msg; + + /* if we have a call, we don't add more terminators */ + if (call->relation_list->next) { + PDEBUG(DROUTER, DEBUG_ERROR, "Multiple call commands from routing are not allowed.\n"); + return; + } + + setup_msg = call->setup_msg; + +next_call: + interface = NULL; + bearer_coding = bearer_capability = bearer_mode = NULL; + calling = calling_type = calling_plan = calling_present = calling_screen = no_calling = NULL; + calling2 = calling2_type = calling2_plan = calling2_present = calling2_screen = no_calling2 = NULL; + redirecting = redirecting_type = redirecting_plan = redirecting_present = redirecting_screen = redirecting_reason = no_redirecting = NULL; + dialing = dialing_type = dialing_plan = NULL; + keypad = NULL; + /* loop through all arguments and stop if there is a ':' */ + for (i = 0; i < argc && argv[i][0] != ':'; i++) { + if (value_of_param(argv[i], "interface", &interface)); + else if (value_of_param(argv[i], "bearer-coding", &bearer_coding)); + else if (value_of_param(argv[i], "bearer-capability", &bearer_capability)); + else if (value_of_param(argv[i], "bearer-mode", &bearer_mode)); + else if (value_of_param(argv[i], "calling", &calling)); + else if (value_of_param(argv[i], "calling-type", &calling_type)); + else if (value_of_param(argv[i], "calling-plan", &calling_plan)); + else if (value_of_param(argv[i], "calling-present", &calling_present)); + else if (value_of_param(argv[i], "calling-screen", &calling_screen)); + else if (value_of_param(argv[i], "no-calling", &no_calling)); + else if (value_of_param(argv[i], "calling2", &calling2)); + else if (value_of_param(argv[i], "calling2-type", &calling2_type)); + else if (value_of_param(argv[i], "calling2-plan", &calling2_plan)); + else if (value_of_param(argv[i], "calling2-present", &calling2_present)); + else if (value_of_param(argv[i], "calling2-screen", &calling2_screen)); + else if (value_of_param(argv[i], "no-calling2", &no_calling2)); + else if (value_of_param(argv[i], "redirecting", &redirecting)); + else if (value_of_param(argv[i], "redirecting-type", &redirecting_type)); + else if (value_of_param(argv[i], "redirecting-plan", &redirecting_plan)); + else if (value_of_param(argv[i], "redirecting-present", &redirecting_present)); + else if (value_of_param(argv[i], "redirecting-screen", &redirecting_screen)); + else if (value_of_param(argv[i], "redirecting-reason", &redirecting_reason)); + else if (value_of_param(argv[i], "no-redirecting", &no_redirecting)); + else if (value_of_param(argv[i], "dialing", &dialing)); + else if (value_of_param(argv[i], "dialing-type", &dialing_type)); + else if (value_of_param(argv[i], "dialing-plan", &dialing_plan)); + else if (value_of_param(argv[i], "keypad", &keypad)); + else + PDEBUG(DROUTER, DEBUG_ERROR, "Unknown 'call' parameter '%s' from routing.\n", argv[i]); + } + /* if more calls, then forward arguments behind colon, otherwise set argc to 0 */ + if (i < argc) { + argv += i + 1; + argc -= i + 1; + } else + argc = 0; + + if (!interface) { + PDEBUG(DROUTER, DEBUG_ERROR, "'call' command without 'interface' parameter.\n"); + goto try_next; + } + + calls++; + + /* set call forking, if we have more than one terminating call */ + if (calls > 1) + call->forking = 1; + + /* create endpoint */ + osmo_cc_call_t *cc_call = osmo_cc_call_new(cc_ep); + call_relation_t *relation = relation_create(call); + + /* link with cc */ + relation->cc_callref = cc_call->callref; + + PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-SETUP-IND to terminator.\n", relation_name(relation)); + + /* create setup message */ + new_msg = osmo_cc_new_msg(OSMO_CC_MSG_SETUP_IND); + + /* interface name */ + osmo_cc_add_ie_called_interface(new_msg, interface); + + /* bearer capability */ + rc = osmo_cc_get_ie_bearer(setup_msg, 0, &coding, &capability, &mode); + if (rc >= 0 || bearer_coding || bearer_capability || bearer_mode) { + /* if not preset, use default values */ + if (rc < 0) { + coding = OSMO_CC_CODING_ITU_T; + capability = OSMO_CC_CAPABILITY_AUDIO; + mode = OSMO_CC_MODE_CIRCUIT; + } + /* alter values */ + if (bearer_coding) + coding = atoi(bearer_coding); + if (bearer_capability) + capability = atoi(bearer_capability); + if (bearer_mode) + mode = atoi(bearer_coding); + osmo_cc_add_ie_bearer(new_msg, coding, capability, mode); + } + + /* calling */ + if (!no_calling) { + rc = osmo_cc_get_ie_calling(setup_msg, 0, &type, &plan, &present, &screen, number, sizeof(number)); + if (rc >= 0 || calling_type || calling_plan || calling_present || calling_screen || calling) { + /* if not preset, use default values */ + if (rc < 0) { + type = OSMO_CC_TYPE_UNKNOWN; + plan = OSMO_CC_PLAN_TELEPHONY; + present = 0; + screen = 0; + number[0] = '\0'; + } + /* alter values */ + if (calling_type) + type = atoi(calling_type); + if (calling_plan) + plan = atoi(calling_plan); + if (calling_present) + present = atoi(calling_present); + if (calling_screen) + screen = atoi(calling_screen); + if (!calling) + calling = number; + osmo_cc_add_ie_calling(new_msg, type, plan, present, screen, calling); + } + } + if (!no_calling && !no_calling2) { + rc = osmo_cc_get_ie_calling(setup_msg, 1, &type, &plan, &present, &screen, number, sizeof(number)); + if (rc >= 0 || calling2_type || calling2_plan || calling2_present || calling2_screen || calling2) { + /* if not preset, use default values */ + if (rc < 0) { + type = OSMO_CC_TYPE_UNKNOWN; + plan = OSMO_CC_PLAN_TELEPHONY; + present = 0; + screen = 0; + number[0] = '\0'; + } + /* alter values */ + if (calling2_type) + type = atoi(calling2_type); + if (calling2_plan) + plan = atoi(calling2_plan); + if (calling2_present) + present = atoi(calling2_present); + if (calling2_screen) + screen = atoi(calling2_screen); + if (!calling2) + calling2 = number; + osmo_cc_add_ie_calling(new_msg, type, plan, present, screen, calling2); + } + } + + /* redirecting */ + if (!no_redirecting) { + rc = osmo_cc_get_ie_redir(setup_msg, 0, &type, &plan, &present, &screen, &reason, number, sizeof(number)); + if (rc >= 0 || redirecting_type || redirecting_plan || redirecting_present || redirecting_screen || redirecting) { + /* if not preset, use default values */ + if (rc < 0) { + type = OSMO_CC_TYPE_UNKNOWN; + plan = OSMO_CC_PLAN_TELEPHONY; + present = 0; + screen = 0; + reason = OSMO_CC_REDIR_REASON_UNKNOWN; + number[0] = '\0'; + } + /* alter values */ + if (redirecting_type) + type = atoi(redirecting_type); + if (redirecting_plan) + plan = atoi(redirecting_plan); + if (redirecting_present) + present = atoi(redirecting_present); + if (redirecting_screen) + screen = atoi(redirecting_screen); + if (!redirecting) + redirecting = number; + osmo_cc_add_ie_redir(new_msg, type, plan, present, screen, reason, redirecting); + } + } + + /* dialing */ + rc = osmo_cc_get_ie_called(setup_msg, 0, &type, &plan, number, sizeof(number)); + if (rc >= 0 || dialing_type || dialing_plan || dialing) { + /* if not preset, use default values */ + if (rc < 0) { + type = OSMO_CC_TYPE_UNKNOWN; + plan = OSMO_CC_PLAN_TELEPHONY; + } + /* alter values */ + if (dialing_type) + type = atoi(dialing_type); + if (dialing_plan) + plan = atoi(dialing_plan); + if (!dialing) + dialing = ""; + osmo_cc_add_ie_called(new_msg, type, plan, dialing); + } + + /* keypad */ + if (keypad) { + if (keypad[0]) + osmo_cc_add_ie_keypad(new_msg, keypad); + } + + /* only if RTP-Proxy is used */ + if (call->relation_list->rtp_proxy) { + PDEBUG(DROUTER, DEBUG_DEBUG, "Sending our codecs to the terminator.\n"); + relation->cc_session = osmo_cc_helper_audio_offer(relation, codecs, receive_terminator, new_msg, 1); + } else + /* sdp from originator's setup message */ + if (call->relation_list->sdp) + osmo_cc_add_ie_sdp(new_msg, call->relation_list->sdp); + + /* send message to osmo-cc */ + osmo_cc_ll_msg(cc_ep, relation->cc_callref, new_msg); + + /* remember this, since we cannot do RTP-Proxy after */ + call->sdp_forwarded = 1; + + /* store peer info for status */ + strncpy(relation->interface, interface, sizeof(relation->interface) - 1); + strncpy(relation->id, dialing, sizeof(relation->id) - 1); + + /* update call state for status display */ + relation->state = CALL_STATE_SETUP; + status_needs_update = 1; + +try_next: + /* there is another call */ + if (argc) + goto next_call; +} + +/* routing orders us to hangup all terminating calls */ +static void routing_call_stop(call_t *call) +{ + call_relation_t *relation; + osmo_cc_msg_t *new_msg; + + /* send message to all terminators, if any */ + while (call->relation_list->next) { + relation = call->relation_list->next; + PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-REL-IND to terminator.\n", relation_name(relation)); + new_msg = osmo_cc_new_msg(OSMO_CC_MSG_REL_IND); + osmo_cc_add_ie_cause(new_msg, cc_ep->serving_location, OSMO_CC_ISDN_CAUSE_NORM_CALL_CLEAR, 0, 0); + osmo_cc_ll_msg(cc_ep, relation->cc_callref, new_msg); + relation_destroy(relation); + } +} + +/* routing orders us to set call into overlap state */ +static void routing_overlap(call_t *call) +{ + call_relation_t *relation = call->relation_list; + osmo_cc_msg_t *new_msg; + + if (call->state != CALL_STATE_SETUP) + return; + + new_state(call, CALL_STATE_OVERLAP); + + PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-SETUP-ACK-IND to originator.\n", relation_name(relation)); + + /* send message to originator */ + new_msg = osmo_cc_new_msg(OSMO_CC_MSG_SETUP_ACK_IND); + + /* send SDP answer */ + proxy_send_sdp_answer(relation, new_msg); + + osmo_cc_ll_msg(cc_ep, relation->cc_callref, new_msg); +} + +/* routing orders us to set call into proceeding state */ +static void routing_proceeding(call_t *call) +{ + call_relation_t *relation = call->relation_list; + osmo_cc_msg_t *new_msg; + + if (call->state != CALL_STATE_SETUP + && call->state != CALL_STATE_OVERLAP) + return; + + new_state(call, CALL_STATE_PROCEEDING); + + PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-PROC-IND to originator.\n", relation_name(relation)); + + /* send message to originator */ + new_msg = osmo_cc_new_msg(OSMO_CC_MSG_PROC_IND); + + /* send SDP answer */ + proxy_send_sdp_answer(relation, new_msg); + + osmo_cc_ll_msg(cc_ep, relation->cc_callref, new_msg); +} + +/* routing orders us to set call into alerting state */ +static void routing_alerting(call_t *call) +{ + call_relation_t *relation = call->relation_list; + osmo_cc_msg_t *new_msg; + + if (call->state != CALL_STATE_SETUP + && call->state != CALL_STATE_OVERLAP + && call->state != CALL_STATE_PROCEEDING) + return; + + new_state(call, CALL_STATE_ALERTING); + + PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-ALERT-IND to originator.\n", relation_name(relation)); + + /* send message to originator */ + new_msg = osmo_cc_new_msg(OSMO_CC_MSG_ALERT_IND); + + /* send SDP answer */ + proxy_send_sdp_answer(relation, new_msg); + + osmo_cc_ll_msg(cc_ep, relation->cc_callref, new_msg); +} + +/* routing orders us to set call into answer state */ +static void routing_answer(call_t *call) +{ + call_relation_t *relation = call->relation_list; + osmo_cc_msg_t *new_msg; + + if (call->state != CALL_STATE_SETUP + && call->state != CALL_STATE_OVERLAP + && call->state != CALL_STATE_PROCEEDING + && call->state != CALL_STATE_ALERTING) + return; + + PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-SETUP-CNF to originator.\n", relation_name(relation)); + + new_state(call, CALL_STATE_CONNECT); + + /* send message to originator */ + new_msg = osmo_cc_new_msg(OSMO_CC_MSG_SETUP_CNF); + + /* send SDP answer */ + proxy_send_sdp_answer(relation, new_msg); + + osmo_cc_ll_msg(cc_ep, relation->cc_callref, new_msg); +} + +/* routing orders us to dsiconnect/release the call */ +static void routing_disc_rel(call_t *call, int argc, const char *argv[], int disconnect) +{ + call_relation_t *relation = call->relation_list; + uint8_t cause = 0; + osmo_cc_msg_t *new_msg; + int i; + + /* get cause, if any */ + for (i = 0; i < argc; i++) { + if (!strncmp(argv[i], "cause=", 6)) + cause = atoi(argv[i] + 6); + else + PDEBUG(DROUTER, DEBUG_ERROR, "Unknown 'disconnect' / 'release' parameter '%s' from routing.\n", argv[i]); + } + + PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-%s-IND to originator.\n", relation_name(relation), (disconnect) ? "DISC" : "REL"); + + /* send message to originator */ + new_msg = osmo_cc_new_msg((disconnect) ? OSMO_CC_MSG_DISC_IND : OSMO_CC_MSG_REL_IND); + if (disconnect) { + /* send SDP answer */ + proxy_send_sdp_answer(relation, new_msg); + } + /* add cause */ + osmo_cc_add_ie_cause(new_msg, cc_ep->serving_location, cause, 0, 0); + osmo_cc_ll_msg(cc_ep, relation->cc_callref, new_msg); + + /* send message to all terminators, if any */ + for (relation = relation->next; relation; relation = relation->next) { + PDEBUG(DROUTER, DEBUG_DEBUG, "%s CC-REL-IND to terminator.\n", relation_name(relation)); + new_msg = osmo_cc_new_msg(OSMO_CC_MSG_REL_IND); + /* add cause */ + osmo_cc_add_ie_cause(new_msg, cc_ep->serving_location, OSMO_CC_ISDN_CAUSE_NORM_CALL_CLEAR, 0, 0); + osmo_cc_ll_msg(cc_ep, relation->cc_callref, new_msg); + } + + if (!disconnect) { + /* destroy call */ + call_destroy(call); + } +} + +#define db2level(db) pow(10, (double)(db) / 20.0) + +void recv_dtmf(void *priv, char digit, dtmf_meas_t __attribute__((unused)) *meas) +{ + call_relation_t *relation = (call_relation_t *)priv; + char digit_string[7] = "dtmf x"; + + if (!relation->call->routing.routing) + return; + + digit_string[5] = digit; + routing_send(&relation->call->routing, digit_string); +} + +/* routing orders us to enable DTMF decoding */ +static void routing_dtmf(call_t *call) +{ + call_relation_t *relation = call->relation_list; + + dtmf_decode_exit(&relation->dtmf_dec); + + /* we add 13, because we working at speech level and not at 0dBm, wich is -13 dBm */ + dtmf_decode_init(&relation->dtmf_dec, relation, recv_dtmf, 8000, db2level(6.0 + 13.0), db2level(-30.0 + 13.0)); + + relation->dtmf_dec_enable = 1; +} + +/* routing orders us to disable DTMF decoding */ +static void routing_dtmf_stop(call_t *call) +{ + call_relation_t *relation = call->relation_list; + + dtmf_decode_exit(&relation->dtmf_dec); + + relation->dtmf_dec_enable = 0; +} + +/* routing failed, release the call */ +static void routing_error(call_t *call, const char *error) +{ + osmo_cc_msg_t *new_msg; + call_relation_t *relation; + + PDEBUG(DROUTER, DEBUG_ERROR, "Routing script error: '%s'\n", error); + + /* send message to originator */ + new_msg = osmo_cc_new_msg(OSMO_CC_MSG_REL_IND); + osmo_cc_add_ie_cause(new_msg, cc_ep->serving_location, OSMO_CC_ISDN_CAUSE_NETWORK_OOO, 0, 0); + osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg); + + /* send message to all terminators, if any */ + for (relation = call->relation_list->next; relation; relation = relation->next) { + new_msg = osmo_cc_new_msg(OSMO_CC_MSG_REL_IND); + osmo_cc_add_ie_cause(new_msg, cc_ep->serving_location, OSMO_CC_ISDN_CAUSE_NETWORK_OOO, 0, 0); + osmo_cc_ll_msg(cc_ep, relation->cc_callref, new_msg); + } +} + +#if 0 +/* routing script says something */ +static void routing_say(call_t *call, const char *error) +{ + char text[1024] = ""; + fuer alle argv + fuege text hinzu + PDEBUG(DROUTER, DEBUG_NOTICE, "Routing script says: %s\n", text); + das script anpassen +} +#endif + +void routing_receive_stdout(routing_t *routing, const char *string) +{ + call_t *call = routing->call; + int argc = 0; + const char *argv[256], *token; + + /* convert string into tokens */ + while ((token = osmo_cc_strtok_quotes(&string))) + argv[argc++] = strdup(token); + if (!argc) + return; + + if (!strcasecmp(argv[0], "rtp-proxy")) + routing_rtp_proxy(call); + else + if (!strcasecmp(argv[0], "play")) + routing_play(call, argc - 1, argv + 1); + else + if (!strcasecmp(argv[0], "play-stop")) + routing_play_stop(call); + else + if (!strcasecmp(argv[0], "record")) + routing_record(call, argc - 1, argv + 1); + else + if (!strcasecmp(argv[0], "record-stop")) + routing_record_stop(call); + else + if (!strcasecmp(argv[0], "tx-gain")) + routing_gain(call, argc - 1, argv + 1, 1); + else + if (!strcasecmp(argv[0], "rx-gain")) + routing_gain(call, argc - 1, argv + 1, 0); + else + if (!strcasecmp(argv[0], "call")) + routing_call(call, argc - 1, argv + 1); + else + if (!strcasecmp(argv[0], "call-stop")) + routing_call_stop(call); + else + if (!strcasecmp(argv[0], "overlap")) + routing_overlap(call); + else + if (!strcasecmp(argv[0], "proceeding")) + routing_proceeding(call); + else + if (!strcasecmp(argv[0], "alerting")) + routing_alerting(call); + else + if (!strcasecmp(argv[0], "answer")) + routing_answer(call); + else + if (!strcasecmp(argv[0], "disconnect")) + routing_disc_rel(call, argc - 1, argv + 1, 1); + else + if (!strcasecmp(argv[0], "release")) + routing_disc_rel(call, argc - 1, argv + 1, 0); + else + if (!strcasecmp(argv[0], "dtmf")) + routing_dtmf(call); + else + if (!strcasecmp(argv[0], "dtmf-stop")) + routing_dtmf_stop(call); + else + if (!strcasecmp(argv[0], "error")) + routing_error(call, (argc > 1) ? argv[1] : "<unknown>"); + else +#if 0 + if (!strcasecmp(argv[0], "say")) + routing_say(call, argc - 1, argv + 1, 0); + else +#endif + PDEBUG(DROUTER, DEBUG_ERROR, "Unknown command '%s' from routing.\n", argv[0]); + + while (argc) + free((char *)argv[--argc]); +} + +void routing_receive_stderr(routing_t *routing, const char *string) +{ + if (routing->call->relation_list) + PDEBUG(DSTDERR, DEBUG_NOTICE, "(call #%d) Routing STDERR: %s\n", routing->call->num, string); + else + PDEBUG(DSTDERR, DEBUG_NOTICE, "Routing STDERR: %s\n", string); +} + +void routing_close(routing_t *routing) +{ + call_t *call = routing->call; + + osmo_cc_msg_t *new_msg; + + PDEBUG(DROUTER, DEBUG_INFO, "(call #%d) Routing script exitted.\n", call->num); + + /* if we have a terminating call, it is fine to continue without routing process */ + if (call->relation_list->next) + return; + + /* in setup state we change to overlap state, so that routing can be restartet with dialing information added */ + if (call->state == CALL_STATE_SETUP) { + /* change state */ + new_state(call, CALL_STATE_OVERLAP); + /* forward message to originator */ + new_msg = osmo_cc_new_msg(OSMO_CC_MSG_SETUP_ACK_IND); + osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg); + return; + } + + /* in overlap state we wait for more information to be added */ + if (call->state == CALL_STATE_OVERLAP) { + return; + } + + /* there is no way to dial more digits, so we release the call */ + new_msg = osmo_cc_new_msg(OSMO_CC_MSG_REL_IND); + osmo_cc_add_ie_cause(new_msg, cc_ep->serving_location, OSMO_CC_ISDN_CAUSE_NO_ROUTE, 0, 0); + osmo_cc_ll_msg(cc_ep, call->relation_list->cc_callref, new_msg); + + /* destroy call */ + call_destroy(call); +} + +#warning add progress, if terminating call sends sdp but call state already reached + +#warning beim disc muss progress geprueft werden und damit entschieden ob wir audio mitsenden sollen + |