MNCC<->SIP bridge; attaches to OsmoMSC to interface with external SIP VoIP telephony https://osmocom.org/projects/osmo-sip-conector
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osmo-sip-connector/src/call.c

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/*
* (C) 2016 by Holger Hans Peter Freyther
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "call.h"
#include "logging.h"
#include <talloc.h>
extern void *tall_mncc_ctx;
LLIST_HEAD(g_call_list);
static uint32_t last_call_id = 5000;
const struct value_string call_type_vals[] = {
{ CALL_TYPE_NONE, "NONE" },
{ CALL_TYPE_SIP, "SIP" },
{ CALL_TYPE_MNCC, "MNCC" },
{ 0, NULL },
};
const struct value_string mncc_state_vals[] = {
{ MNCC_CC_INITIAL, "INITIAL" },
{ MNCC_CC_PROCEEDING, "PROCEEDING" },
{ MNCC_CC_CONNECTED, "CONNECTED" },
{ MNCC_CC_HOLD, "ON HOLD" },
{ 0, NULL },
};
const struct value_string mncc_dir_vals[] = {
{ MNCC_DIR_MO, "MO" },
{ MNCC_DIR_MT, "MT" },
{ 0, NULL },
};
const struct value_string sip_state_vals[] = {
{ SIP_CC_INITIAL, "INITIAL" },
{ SIP_CC_DLG_CNFD, "CONFIRMED" },
{ SIP_CC_CONNECTED, "CONNECTED" },
{ SIP_CC_HOLD, "ON HOLD" },
{ 0, NULL },
};
const struct value_string sip_dir_vals[] = {
{ SIP_DIR_MO, "MO" },
{ SIP_DIR_MT, "MT" },
{ 0, NULL },
};
void calls_init(void)
{}
void call_leg_release(struct call_leg *leg)
{
struct call *call = leg->call;
if (leg == call->initial)
call->initial = NULL;
else if (leg == call->remote)
call->remote = NULL;
else {
LOGP(DAPP, LOGL_ERROR, "call(%u) with unknown leg(%p/%d)\n",
call->id, leg, leg->type);
return;
}
talloc_free(leg);
if (!call->initial && !call->remote) {
uint32_t id = call->id;
llist_del(&call->entry);
talloc_free(call);
LOGP(DAPP, LOGL_DEBUG, "call(%u) released.\n", id);
}
}
struct call *call_mncc_create(void)
{
struct call *call;
call = talloc_zero(tall_mncc_ctx, struct call);
if (!call) {
LOGP(DCALL, LOGL_ERROR, "Failed to allocate memory for call\n");
return NULL;
}
call->id = ++last_call_id;
call->initial = (struct call_leg *) talloc_zero(call, struct mncc_call_leg);
if (!call->initial) {
LOGP(DCALL, LOGL_ERROR, "Failed to allocate MNCC leg\n");
talloc_free(call);
return NULL;
}
call->initial->type = CALL_TYPE_MNCC;
call->initial->call = call;
llist_add(&call->entry, &g_call_list);
return call;
}
struct call *call_sip_create(void)
{
struct call *call;
call = talloc_zero(tall_mncc_ctx, struct call);
if (!call) {
LOGP(DCALL, LOGL_ERROR, "Failed to allocate memory for call\n");
return NULL;
}
call->id = ++last_call_id;
call->initial = (struct call_leg *) talloc_zero(call, struct sip_call_leg);
if (!call->initial) {
LOGP(DCALL, LOGL_ERROR, "Failed to allocate SIP leg\n");
talloc_free(call);
return NULL;
}
call->initial->type = CALL_TYPE_SIP;
call->initial->call = call;
llist_add(&call->entry, &g_call_list);
return call;
}
struct call_leg *call_leg_other(struct call_leg *leg)
{
if (leg->call->initial == leg)
return leg->call->remote;
if (leg->call->remote == leg)
return leg->call->initial;
LOGP(DAPP, LOGL_NOTICE, "leg(0x%p) not belonging to call(%u)\n",
leg, leg->call->id);
return NULL;
}
const char *call_leg_type(struct call_leg *leg)
{
return get_value_string(call_type_vals, leg->type);
}
const char *call_leg_state(struct call_leg *leg)
{
struct mncc_call_leg *mncc;
struct sip_call_leg *sip;
switch (leg->type) {
case CALL_TYPE_SIP:
sip = (struct sip_call_leg *) leg;
return get_value_string(sip_state_vals, sip->state);
case CALL_TYPE_MNCC:
mncc = (struct mncc_call_leg *) leg;
return get_value_string(mncc_state_vals, mncc->state);
default:
return "unknown call type";
}
}