void next_state_dlg(struct dlg_cell *dlg, int event, int dir, int *old_state,
int *new_state, int *unref, int last_dst_leg, char is_replicated)
{
struct dlg_entry *d_entry;
d_entry = &(d_table->entries[dlg->h_entry]);
*unref = 0;
dlg_lock( d_table, d_entry);
*old_state = dlg->state;
switch (event) {
case DLG_EVENT_TDEL:
switch (dlg->state) {
case DLG_STATE_UNCONFIRMED:
case DLG_STATE_EARLY:
dlg->state = DLG_STATE_DELETED;
unref_dlg_unsafe(dlg,1,d_entry); /* unref from TM CBs*/
*unref = 1; /* unref from hash -> t failed */
break;
case DLG_STATE_CONFIRMED_NA:
case DLG_STATE_CONFIRMED:
unref_dlg_unsafe(dlg,1,d_entry); /* unref from TM CBs*/
break;
case DLG_STATE_DELETED:
/* as the dialog aleady is in DELETE state, it is
dangerous to directly unref it from here as it might
be last ref -> dialog will be destroied and we will end up
with a dangling pointer :D - bogdan */
*unref = 1; /* unref from TM CBs*/
break;
default:
log_next_state_dlg(event, dlg);
}
break;
case DLG_EVENT_RPL1xx:
switch (dlg->state) {
case DLG_STATE_UNCONFIRMED:
case DLG_STATE_EARLY:
dlg->state = DLG_STATE_EARLY;
break;
default:
log_next_state_dlg(event, dlg);
}
break;
case DLG_EVENT_RPL3xx:
switch (dlg->state) {
case DLG_STATE_UNCONFIRMED:
case DLG_STATE_EARLY:
dlg->state = DLG_STATE_DELETED;
*unref = 1; /* unref from hash -> t failed */
break;
default:
log_next_state_dlg(event, dlg);
}
break;
case DLG_EVENT_RPL2xx:
switch (dlg->state) {
case DLG_STATE_DELETED:
if (dlg->flags&DLG_FLAG_HASBYE) {
log_next_state_dlg(event, dlg);
break;
}
ref_dlg_unsafe(dlg,1); /* back in hash */
case DLG_STATE_UNCONFIRMED:
case DLG_STATE_EARLY:
dlg->state = DLG_STATE_CONFIRMED_NA;
break;
case DLG_STATE_CONFIRMED_NA:
case DLG_STATE_CONFIRMED:
break;
default:
log_next_state_dlg(event, dlg);
}
break;
case DLG_EVENT_REQACK:
switch (dlg->state) {
case DLG_STATE_CONFIRMED_NA:
dlg->state = DLG_STATE_CONFIRMED;
break;
case DLG_STATE_CONFIRMED:
break;
case DLG_STATE_DELETED:
break;
default:
log_next_state_dlg(event, dlg);
}
break;
case DLG_EVENT_REQBYE:
switch (dlg->state) {
case DLG_STATE_CONFIRMED_NA:
case DLG_STATE_CONFIRMED:
if (dir == DLG_DIR_DOWNSTREAM &&
last_dst_leg!=dlg->legs_no[DLG_LEG_200OK] )
/* to end the call, the BYE must be received
* on the same leg as the 200 OK for INVITE */
break;
dlg->flags |= DLG_FLAG_HASBYE;
dlg->state = DLG_STATE_DELETED;
*unref = 1; /* unref from hash -> dialog ended */
break;
case DLG_STATE_DELETED:
break;
default:
/* only case for BYEs in early or unconfirmed states
* is for requests generate by caller or callee.
* We never internally generate BYEs for early dialogs
*
* RFC says caller may send BYEs for early dialogs,
* while the callee side MUST not send such requests*/
if (last_dst_leg == 0)
log_next_state_dlg(event, dlg);
}
break;
case DLG_EVENT_REQPRACK:
switch (dlg->state) {
case DLG_STATE_EARLY:
case DLG_STATE_CONFIRMED_NA:
case DLG_STATE_CONFIRMED:
break;
default:
log_next_state_dlg(event, dlg);
}
break;
case DLG_EVENT_REQ:
switch (dlg->state) {
case DLG_STATE_EARLY:
case DLG_STATE_CONFIRMED_NA:
case DLG_STATE_CONFIRMED:
break;
default:
log_next_state_dlg(event, dlg);
}
break;
default:
LM_INFO("unknown event %d in state %d "
"for dlg %p [%u:%u] with clid '%.*s' and tags '%.*s' '%.*s'\n",
event, dlg->state, dlg, dlg->h_entry, dlg->h_id,
dlg->callid.len, dlg->callid.s,
dlg_leg_print_info( dlg, DLG_CALLER_LEG, tag),
dlg_leg_print_info( dlg, callee_idx(dlg), tag));
}
*new_state = dlg->state;
dlg_unlock( d_table, d_entry);
if (*old_state != *new_state)
raise_state_changed_event( dlg->h_entry, dlg->h_id,
(unsigned int)(*old_state), (unsigned int)(*new_state) );
if ( !is_replicated && dialog_replicate_cluster &&
(*old_state==DLG_STATE_CONFIRMED_NA || *old_state==DLG_STATE_CONFIRMED) &&
dlg->state==DLG_STATE_DELETED )
replicate_dialog_deleted(dlg);
LM_DBG("dialog %p changed from state %d to "
"state %d, due event %d\n",dlg,*old_state,*new_state,event);
}
/*!
* \brief Update a dialog state according a event and the old state
*
* This functions implement the main state machine that update a dialog
* state according a processed event and the current state. If necessary
* it will delete the processed dialog. The old and new state are also
* saved for reference.
* \param dlg updated dialog
* \param event current event
* \param old_state old dialog state
* \param new_state new dialog state
* \param unref set to 1 when the dialog was deleted, 0 otherwise
*/
void next_state_dlg(dlg_cell_t *dlg, int event,
int *old_state, int *new_state, int *unref)
{
dlg_entry_t *d_entry;
d_entry = &(d_table->entries[dlg->h_entry]);
*unref = 0;
dlg_lock( d_table, d_entry);
*old_state = dlg->state;
switch (event) {
case DLG_EVENT_TDEL:
switch (dlg->state) {
case DLG_STATE_UNCONFIRMED:
case DLG_STATE_EARLY:
dlg->state = DLG_STATE_DELETED;
unref_dlg_unsafe(dlg,1,d_entry);
*unref = 1;
break;
case DLG_STATE_CONFIRMED_NA:
case DLG_STATE_CONFIRMED:
unref_dlg_unsafe(dlg,1,d_entry);
break;
case DLG_STATE_DELETED:
*unref = 1;
break;
default:
log_next_state_dlg(event, dlg);
}
break;
case DLG_EVENT_RPL1xx:
switch (dlg->state) {
case DLG_STATE_UNCONFIRMED:
case DLG_STATE_EARLY:
dlg->state = DLG_STATE_EARLY;
break;
default:
log_next_state_dlg(event, dlg);
}
break;
case DLG_EVENT_RPL3xx:
switch (dlg->state) {
case DLG_STATE_UNCONFIRMED:
case DLG_STATE_EARLY:
dlg->state = DLG_STATE_DELETED;
*unref = 1;
break;
default:
log_next_state_dlg(event, dlg);
}
break;
case DLG_EVENT_RPL2xx:
switch (dlg->state) {
case DLG_STATE_DELETED:
if (dlg->dflags&DLG_FLAG_HASBYE) {
LM_CRIT("bogus event %d in state %d (with BYE) "
"for dlg %p [%u:%u] with clid '%.*s' and tags '%.*s' '%.*s'\n",
event, dlg->state, dlg, dlg->h_entry, dlg->h_id,
dlg->callid.len, dlg->callid.s,
dlg->tag[DLG_CALLER_LEG].len, dlg->tag[DLG_CALLER_LEG].s,
dlg->tag[DLG_CALLEE_LEG].len, dlg->tag[DLG_CALLEE_LEG].s);
break;
}
ref_dlg_unsafe(dlg,1);
case DLG_STATE_UNCONFIRMED:
case DLG_STATE_EARLY:
dlg->state = DLG_STATE_CONFIRMED_NA;
break;
case DLG_STATE_CONFIRMED_NA:
case DLG_STATE_CONFIRMED:
break;
default:
log_next_state_dlg(event, dlg);
}
break;
case DLG_EVENT_REQACK:
switch (dlg->state) {
case DLG_STATE_CONFIRMED_NA:
dlg->state = DLG_STATE_CONFIRMED;
break;
case DLG_STATE_CONFIRMED:
break;
case DLG_STATE_DELETED:
break;
default:
log_next_state_dlg(event, dlg);
}
break;
case DLG_EVENT_REQBYE:
switch (dlg->state) {
case DLG_STATE_CONFIRMED_NA:
case DLG_STATE_CONFIRMED:
dlg->dflags |= DLG_FLAG_HASBYE;
dlg->state = DLG_STATE_DELETED;
*unref = 1;
break;
case DLG_STATE_EARLY:
case DLG_STATE_DELETED:
break;
default:
log_next_state_dlg(event, dlg);
}
break;
case DLG_EVENT_REQPRACK:
switch (dlg->state) {
case DLG_STATE_EARLY:
case DLG_STATE_CONFIRMED_NA:
case DLG_STATE_DELETED:
break;
default:
log_next_state_dlg(event, dlg);
}
break;
case DLG_EVENT_REQ:
switch (dlg->state) {
case DLG_STATE_EARLY:
case DLG_STATE_CONFIRMED_NA:
case DLG_STATE_CONFIRMED:
case DLG_STATE_DELETED:
break;
default:
log_next_state_dlg(event, dlg);
}
break;
default:
LM_CRIT("unknown event %d in state %d "
"for dlg %p [%u:%u] with clid '%.*s' and tags '%.*s' '%.*s'\n",
event, dlg->state, dlg, dlg->h_entry, dlg->h_id,
dlg->callid.len, dlg->callid.s,
dlg->tag[DLG_CALLER_LEG].len, dlg->tag[DLG_CALLER_LEG].s,
dlg->tag[DLG_CALLEE_LEG].len, dlg->tag[DLG_CALLEE_LEG].s);
}
*new_state = dlg->state;
/* remove the dialog from profiles when is not no longer active */
if(*new_state==DLG_STATE_DELETED && dlg->profile_links!=NULL
&& *old_state!=*new_state) {
destroy_linkers(dlg->profile_links);
dlg->profile_links = NULL;
}
dlg_unlock( d_table, d_entry);
LM_DBG("dialog %p changed from state %d to "
"state %d, due event %d (ref %d)\n", dlg, *old_state, *new_state, event,
dlg->ref);
}
void next_state_dlg(struct dlg_cell *dlg, int event,
int *old_state, int *new_state, int *unref)
{
struct dlg_entry *d_entry;
d_entry = &(d_table->entries[dlg->h_entry]);
*unref = 0;
dlg_lock( d_table, d_entry);
*old_state = dlg->state;
switch (event) {
case DLG_EVENT_TDEL:
switch (dlg->state) {
case DLG_STATE_UNCONFIRMED:
case DLG_STATE_EARLY:
dlg->state = DLG_STATE_DELETED;
unref_dlg_unsafe(dlg,1,d_entry); /* unref from TM CBs*/
*unref = 1; /* unref from hash -> t failed */
break;
case DLG_STATE_CONFIRMED_NA:
case DLG_STATE_CONFIRMED:
unref_dlg_unsafe(dlg,1,d_entry); /* unref from TM CBs*/
break;
case DLG_STATE_DELETED:
/* as the dialog aleady is in DELETE state, it is
dangerous to directly unref it from here as it might
be last ref -> dialog will be destroied and we will end up
with a dangling pointer :D - bogdan */
*unref = 1; /* unref from TM CBs*/
break;
default:
log_next_state_dlg(event, dlg);
}
break;
case DLG_EVENT_RPL1xx:
switch (dlg->state) {
case DLG_STATE_UNCONFIRMED:
case DLG_STATE_EARLY:
dlg->state = DLG_STATE_EARLY;
break;
default:
log_next_state_dlg(event, dlg);
}
break;
case DLG_EVENT_RPL3xx:
switch (dlg->state) {
case DLG_STATE_UNCONFIRMED:
case DLG_STATE_EARLY:
dlg->state = DLG_STATE_DELETED;
*unref = 1; /* unref from hash -> t failed */
break;
default:
log_next_state_dlg(event, dlg);
}
break;
case DLG_EVENT_RPL2xx:
switch (dlg->state) {
case DLG_STATE_DELETED:
if (dlg->flags&DLG_FLAG_HASBYE) {
log_next_state_dlg(event, dlg);
break;
}
ref_dlg_unsafe(dlg,1); /* back in hash */
case DLG_STATE_UNCONFIRMED:
case DLG_STATE_EARLY:
dlg->state = DLG_STATE_CONFIRMED_NA;
break;
case DLG_STATE_CONFIRMED_NA:
case DLG_STATE_CONFIRMED:
break;
default:
log_next_state_dlg(event, dlg);
}
break;
case DLG_EVENT_REQACK:
switch (dlg->state) {
case DLG_STATE_CONFIRMED_NA:
dlg->state = DLG_STATE_CONFIRMED;
break;
case DLG_STATE_CONFIRMED:
break;
case DLG_STATE_DELETED:
break;
default:
log_next_state_dlg(event, dlg);
}
break;
case DLG_EVENT_REQBYE:
switch (dlg->state) {
case DLG_STATE_CONFIRMED_NA:
case DLG_STATE_CONFIRMED:
dlg->flags |= DLG_FLAG_HASBYE;
dlg->state = DLG_STATE_DELETED;
*unref = 1; /* unref from hash -> dialog ended */
break;
case DLG_STATE_DELETED:
break;
default:
log_next_state_dlg(event, dlg);
}
break;
case DLG_EVENT_REQPRACK:
switch (dlg->state) {
case DLG_STATE_EARLY:
case DLG_STATE_CONFIRMED_NA:
break;
default:
log_next_state_dlg(event, dlg);
}
break;
case DLG_EVENT_REQ:
switch (dlg->state) {
case DLG_STATE_EARLY:
case DLG_STATE_CONFIRMED_NA:
case DLG_STATE_CONFIRMED:
break;
default:
log_next_state_dlg(event, dlg);
}
break;
default:
LM_CRIT("unknown event %d in state %d "
"for dlg %p [%u:%u] with clid '%.*s' and tags '%.*s' '%.*s'\n",
event, dlg->state, dlg, dlg->h_entry, dlg->h_id,
dlg->callid.len, dlg->callid.s,
dlg_leg_print_info( dlg, DLG_CALLER_LEG, tag),
dlg_leg_print_info( dlg, callee_idx(dlg), tag));
}
*new_state = dlg->state;
dlg_unlock( d_table, d_entry);
LM_DBG("dialog %p changed from state %d to "
"state %d, due event %d\n",dlg,*old_state,*new_state,event);
}
