mncc: Dispatch setup and issue rtp create in response then continue

The code is not tested and might be broken. Parse the setup request
of a MO call, create a new "call" with a MNCC leg and then issue the
call to create a RTP socket. Once this has been done, release the call
as the code to open a second leg has not been written yet.
zecke/wip/sip-invite-cancel
Holger Hans Peter Freyther 7 years ago
parent 90e7139691
commit 29b556490f
  1. 25
      src/call.c
  2. 14
      src/call.h
  3. 163
      src/mncc.c
  4. 3
      src/mncc.h

@ -23,8 +23,10 @@
#include <talloc.h>
extern void *tall_mncc_ctx;
LLIST_HEAD(g_call_list);
static uint32_t last_call_id = 5000;
void calls_init(void)
{}
@ -48,3 +50,26 @@ void call_leg_release(struct call *call, struct call_leg *leg)
talloc_free(call);
}
}
struct call *sip_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;
llist_add(&call->entry, &g_call_list);
return call;
}

@ -2,6 +2,8 @@
#include <osmocom/core/linuxlist.h>
#include "mncc_protocol.h"
struct sip_agent;
struct mncc_connection;
@ -42,9 +44,18 @@ struct sip_call_leg {
struct sip_agent *agent;
};
enum mncc_cc_state {
MNCC_CC_INITIAL,
};
struct mncc_call_leg {
struct call_leg base;
enum mncc_cc_state state;
uint32_t callref;
struct gsm_mncc_number called;
struct gsm_mncc_number calling;
struct mncc_connection *conn;
};
@ -53,3 +64,6 @@ void calls_init(void);
void call_leg_release(struct call *call, struct call_leg *leg);
struct call *sip_call_mncc_create(void);

@ -22,8 +22,10 @@
#include "mncc_protocol.h"
#include "app.h"
#include "logging.h"
#include "call.h"
#include <osmocom/core/socket.h>
#include <osmocom/core/utils.h>
#include <sys/socket.h>
#include <sys/un.h>
@ -31,6 +33,88 @@
#include <errno.h>
#include <unistd.h>
static void close_connection(struct mncc_connection *conn);
static struct mncc_call_leg *mncc_find_leg(uint32_t callref, struct call **out_call)
{
struct call *call;
llist_for_each_entry(call, &g_call_list, entry) {
if (call->initial && call->initial->type == CALL_TYPE_MNCC) {
struct mncc_call_leg *leg = (struct mncc_call_leg *) call->initial;
if (leg->callref == callref) {
*out_call = call;
return leg;
}
}
if (call->remote && call->remote->type == CALL_TYPE_MNCC) {
struct mncc_call_leg *leg = (struct mncc_call_leg *) call->remote;
if (leg->callref == callref) {
*out_call = call;
return leg;
}
}
}
*out_call = NULL;
return NULL;
}
static void mncc_send(struct mncc_connection *conn, uint32_t msg_type, uint32_t callref)
{
int rc;
struct gsm_mncc mncc = { 0, };
mncc.msg_type = msg_type;
mncc.callref = callref;
/*
* TODO: we need to put cause in here for release or such? shall we return a
* static struct?
*/
rc = write(conn->fd.fd, &mncc, sizeof(mncc));
if (rc != sizeof(mncc)) {
LOGP(DMNCC, LOGL_ERROR, "Failed to send message call(%u)\n", callref);
close_connection(conn);
}
}
static void mncc_rtp_send(struct mncc_connection *conn, uint32_t msg_type, uint32_t callref)
{
int rc;
struct gsm_mncc_rtp mncc = { 0, };
mncc.msg_type = msg_type;
mncc.callref = callref;
rc = write(conn->fd.fd, &mncc, sizeof(mncc));
if (rc != sizeof(mncc)) {
LOGP(DMNCC, LOGL_ERROR, "Failed to send message call(%u)\n", callref);
close_connection(conn);
}
}
static void mncc_call_leg_release(struct call *call, struct call_leg *_leg)
{
struct mncc_call_leg *leg;
OSMO_ASSERT(_leg->type == CALL_TYPE_MNCC);
leg = (struct mncc_call_leg *) _leg;
/* drop it directly, if not connected */
if (leg->conn->state != MNCC_READY)
return call_leg_release(call, _leg);
switch (leg->state) {
case MNCC_CC_INITIAL:
mncc_send(leg->conn, MNCC_REJ_REQ, leg->callref);
call_leg_release(call, _leg);
break;
}
}
static void close_connection(struct mncc_connection *conn)
{
osmo_fd_unregister(&conn->fd);
@ -41,6 +125,79 @@ static void close_connection(struct mncc_connection *conn)
conn->on_disconnect(conn);
}
static void check_rtp_create(struct mncc_connection *conn, char *buf, int rc)
{
struct gsm_mncc_rtp *rtp;
struct call *call;
struct mncc_call_leg *leg;
if (rc < sizeof(*rtp)) {
LOGP(DMNCC, LOGL_ERROR, "gsm_mncc_rtp of wrong size %d < %d\n",
rc, sizeof(*rtp));
return close_connection(conn);
}
rtp = (struct gsm_mncc_rtp *) buf;
leg = mncc_find_leg(rtp->callref, &call);
if (!leg) {
LOGP(DMNCC, LOGL_ERROR, "call(%u) can not be found\n", rtp->callref);
return mncc_send(conn, MNCC_REJ_REQ, rtp->callref);
}
/* TODO.. now we can continue with the call */
mncc_send(leg->conn, MNCC_REJ_REQ, leg->callref);
call_leg_release(call, &leg->base);
}
static void check_setup(struct mncc_connection *conn, char *buf, int rc)
{
struct gsm_mncc *data;
struct call *call;
struct mncc_call_leg *leg;
if (rc != sizeof(*data)) {
LOGP(DMNCC, LOGL_ERROR, "gsm_mncc of wrong size %d vs. %d\n",
rc, sizeof(*data));
return close_connection(conn);
}
data = (struct gsm_mncc *) buf;
/* screen arguments */
if ((data->fields & MNCC_F_CALLED) == 0) {
LOGP(DMNCC, LOGL_ERROR,
"MNCC call(%u) without called addr fields(%u)\n",
data->callref, data->fields);
return mncc_send(conn, MNCC_REJ_REQ, data->callref);
}
if ((data->fields & MNCC_F_CALLING) == 0) {
LOGP(DMNCC, LOGL_ERROR,
"MNCC call(%u) without calling addr fields(%u)\n",
data->callref, data->fields);
return mncc_send(conn, MNCC_REJ_REQ, data->callref);
}
/* TODO.. bearer caps and better audio handling */
/* Create an RTP port and then allocate a call */
call = sip_call_mncc_create();
if (!call) {
LOGP(DMNCC, LOGL_ERROR,
"MNCC call(%u) failed to allocate call\n", data->callref);
return mncc_send(conn, MNCC_REJ_REQ, data->callref);
}
leg = (struct mncc_call_leg *) call->initial;
leg->base.release_call = mncc_call_leg_release;
leg->callref = data->callref;
leg->conn = conn;
leg->state = MNCC_CC_INITIAL;
memcpy(&leg->called, &data->called, sizeof(leg->called));
memcpy(&leg->calling, &data->calling, sizeof(leg->calling));
mncc_rtp_send(conn, MNCC_RTP_CREATE, data->callref);
}
static void check_hello(struct mncc_connection *conn, char *buf, int rc)
{
struct gsm_mncc_hello *hello;
@ -105,6 +262,12 @@ static int mncc_data(struct osmo_fd *fd, unsigned int what)
case MNCC_SOCKET_HELLO:
check_hello(conn, buf, rc);
break;
case MNCC_SETUP_IND:
check_setup(conn, buf, rc);
break;
case MNCC_RTP_CREATE:
check_rtp_create(conn, buf, rc);
break;
default:
LOGP(DMNCC, LOGL_ERROR, "Unhandled message type %d/0x%x\n",
msg_type, msg_type);

@ -3,6 +3,8 @@
#include <osmocom/core/select.h>
#include <osmocom/core/timer.h>
#include <stdint.h>
struct app_config;
enum {
@ -18,6 +20,7 @@ struct mncc_connection {
struct osmo_timer_list reconnect;
uint32_t last_callref;
/* callback for application logic */
void (*on_disconnect)(struct mncc_connection *);

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