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Further work on VoMP. MDP message to create a call should now

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do something.
This commit is contained in:
gardners 2012-04-20 05:19:42 +09:30
parent b1a7ccd32f
commit 57be9bef32
2 changed files with 89 additions and 6 deletions
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17
serval.h
View File

@ -1141,6 +1141,9 @@ typedef struct overlay_mdp_addrlist {
#define MDP_VOMPEVENT 7
typedef struct overlay_mdp_vompevent {
/* Once a call has been established, this is how the MDP/VoMP server
and user-end process talk about the call. */
unsigned int call_session_token;
unsigned long long audio_sample_endtime;
unsigned long long last_activity;
#define VOMPEVENT_RINGING (1<<0)
@ -1153,12 +1156,23 @@ typedef struct overlay_mdp_vompevent {
#define VOMPEVENT_DIAL (1<<6)
#define VOMPEVENT_REGISTERINTEREST (1<<7)
#define VOMPEVENT_WITHDRAWINTEREST (1<<8)
#define VOMPEVENT_CALLCREATED (1<<9)
unsigned int flags;
unsigned short audio_sample_bytes;
unsigned char local_state;
unsigned char remote_state;
unsigned char audio_sample_codec;
unsigned char audio_bytes[MDP_MTU-100];
union {
struct {
/* Used to precisely define the call end points during call
setup. */
unsigned char local_did[64];
unsigned char remote_did[64];
unsigned char local_sid[SID_SIZE];
unsigned char remote_sid[SID_SIZE];
};
unsigned char audio_bytes[MDP_MTU-100];
};
} overlay_mdp_vompevent;
typedef struct overlay_mdp_frame {
@ -1220,6 +1234,7 @@ void _serval_debug_free(void *p,char *file,const char *func,int line);
typedef struct vomp_call_half {
unsigned char sid[SID_SIZE];
unsigned char did[64];
unsigned char state;
unsigned char codec;
unsigned int session;

78
vomp.c
View File

@ -18,7 +18,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/*
VoMP works using a 5-state model of a phone call, and relies on MDP for
VoMP works using a 6-state model of a phone call, and relies on MDP for
auth-cryption of frames. VoMP provides it's own replay protection.
*/
@ -30,6 +30,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
the ejection of newly allocated session numbers before the caller has had a chance
to progress the call to a further state. */
int vomp_call_count=0;
int vomp_active_call=-1;
#define VOMP_MAX_CALLS 16
vomp_call_state vomp_call_states[VOMP_MAX_CALLS];
@ -40,6 +41,15 @@ struct sockaddr_un *vomp_interested_usocks[VOMP_MAX_INTERESTED];
int vomp_interested_usock_lengths[VOMP_MAX_INTERESTED];
unsigned long long vomp_interested_expiries[VOMP_MAX_INTERESTED];
vomp_call_state *vomp_find_call_by_session(int session_token)
{
int i;
for(i=0;i<vomp_call_count;i++)
if (session_token==vomp_call_states[i].local.session)
return &vomp_call_states[i];
return NULL;
}
vomp_call_state *vomp_find_or_create_call(unsigned char *remote_sid,
unsigned char *local_sid,
unsigned int sender_session,
@ -105,7 +115,11 @@ vomp_call_state *vomp_find_or_create_call(unsigned char *remote_sid,
return &vomp_call_states[i];
}
int vomp_send_status(vomp_call_state *call)
/* send updated call status to end-point and to any interested listeners as
appropriate */
#define VOMP_TELLINTERESTED (1<<0)
#define VOMP_TELLREMOTE (1<<1)
int vomp_send_status(vomp_call_state *call,int flags)
{
return WHY("Not implemented");
}
@ -248,9 +262,63 @@ int vomp_mdp_event(overlay_mdp_frame *mdp,
}
break;
case VOMPEVENT_DIAL:
/* audio bytes is actually local DID:remote DID tuple. */
/* pull local_did and remote_did and start putting the call together.
These need to be passed to the node being called to provide caller id,
and potentially handle call-routing, e.g., if it is a gateway.
*/
{
/* Populate call structure */
if (vomp_call_count>=VOMP_MAX_CALLS)
return overlay_mdp_reply_error
(mdp_named_socket,recvaddr,recvaddrlen,4004,
"All call slots in use");
int slot=vomp_call_count++;
vomp_call_state *call=&vomp_call_states[slot];
bzero(call,sizeof(vomp_call_state));
bcopy(mdp->vompevent.local_sid,call->local.sid,SID_SIZE);
bcopy(mdp->vompevent.remote_sid,call->remote.sid,SID_SIZE);
bcopy(mdp->vompevent.local_did,call->local.did,64);
bcopy(mdp->vompevent.remote_did,call->remote.did,64);
call->local.state=1;
call->remote.state=0; /* far end has yet to agree that a call is happening */
/* allocate unique call session token, which is how the client will
refer to this call during its life */
while (!call->local.session)
{
if (urandombytes((unsigned char *)&call->local.session,sizeof(int)))
return overlay_mdp_reply_error
(mdp_named_socket,recvaddr,recvaddrlen,4005,
"Insufficient entropy");
int i;
for(i=0;i<vomp_call_count;i++)
if (i!=slot)
if (call->local.session==vomp_call_states[i].local.session) break;
/* reject duplicate call session numbers */
if (i>=vomp_call_count) call->local.session=0;
}
call->local.session&=VOMP_SESSION_MASK;
call->last_activity=overlay_gettime_ms();
/* send status update to remote, thus causing call to be created
(hopefully) at far end. */
return vomp_send_status(call,VOMP_TELLREMOTE|VOMP_TELLINTERESTED);
}
break;
case VOMPEVENT_CALLREJECT: /* hangup is the same */
{
vomp_call_state *call
=vomp_find_call_by_session(mdp->vompevent.call_session_token);
if (!call)
return overlay_mdp_reply_error
(mdp_named_socket,recvaddr,recvaddrlen,4006,
"No such call");
if (call->local.state==VOMP_STATE_INCALL) vomp_call_stop_audio(call);
call->local.state=VOMP_STATE_CALLENDED;
return vomp_send_status(call,VOMP_TELLREMOTE|VOMP_TELLINTERESTED);
}
case VOMPEVENT_AUDIOSTREAMING: /* user supplying audio */
WHY("Handling of in-call audio not yet implemented");
break;
default:
/* didn't understand it, so respond with an error */
return overlay_mdp_reply_error(mdp_named_socket,
@ -304,7 +372,7 @@ int vomp_mdp_received(overlay_mdp_frame *mdp)
/* We have a session number. Send a status update back to sender */
call->last_activity=overlay_gettime_ms();
return vomp_send_status(call);
return vomp_send_status(call,VOMP_TELLREMOTE);
} else {
/* A VoMP packet for a call apparently already in progress */
call=vomp_find_or_create_call(mdp->in.src.sid,mdp->in.dst.sid,
@ -500,7 +568,7 @@ int vomp_mdp_received(overlay_mdp_frame *mdp)
/* touch call timer if the current state has not vetoed by returning */
call->last_activity=overlay_gettime_ms();
/* and then send an update to the call status */
vomp_send_status(call);
vomp_send_status(call,VOMP_TELLREMOTE|VOMP_TELLINTERESTED);
}
}
break;