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freebsd/usr.sbin/i4b/isdnd/fsm.c
Hellmuth Michaelis 03096f2d75 Fix hangup bug; Juha writes: 
Problem 2 is that doing a local hangup (eg. by writing "H" to the
 dialout device) to a call which is already disconnected results in isdnd
 moving the cfg entry to an illegal state, from which there is no
 recovery. This is tricky because there is no way to synchronize local
 hangup with the remote end (ie. the callee can always hang up at an
 inconvenient time)! Hence, patch-2 alters fsm.c's EV_DRQ state table
 such that the local hangup request is processed or ignored in most
 states, even for disconnected calls.

Submitted by:	Juha-Matti Liukkonen <jml@cubical.fi>
2001-07-21 16:28:28 +00:00

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/*
* Copyright (c) 1997, 2001 Hellmuth Michaelis. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*---------------------------------------------------------------------------
*
* FSM for isdnd
* -------------
*
* $FreeBSD$
*
* last edit-date: [Sat Jul 21 18:25:48 2001]
*
*---------------------------------------------------------------------------*/
#include "isdnd.h"
/* table of state descriptions */
static char *state_text[N_STATES] = {
"idle",
"dialing",
"waitdialretry",
"dialretry",
"pcb-dialing",
"pcb-dialfail",
"pcb-waitcall",
"acb-waitdisc",
"acb-waitdial",
"acb-dialing",
"acb-dialfail",
"accepted",
"connected",
"waitdisconnect",
"down",
"alert",
"Illegal State"
};
/* table of event descriptions */
static char *event_text[N_EVENTS] = {
/* incoming messages */
"msg-con-ind",
"msg-con-act-ind",
"msg-disc-ind",
"msg-dialout",
/* local events */
"timeout",
"disconnect-req",
"callback-req",
"alert-req",
/* illegal */
"Illegal Event"
};
/*---------------------------------------------------------------------------*
* illegal state default action
*---------------------------------------------------------------------------*/
static void
F_ill(cfg_entry_t *cep)
{
DBGL(DL_STATE, (log(LL_DBG, "F_ill: Illegal State reached !!!")));
}
/*---------------------------------------------------------------------------*
* No change, No action
*---------------------------------------------------------------------------*/
static void
F_NcNa(cfg_entry_t *cep)
{
}
/*---------------------------------------------------------------------------*
* incoming CONNECT, accepting call
*---------------------------------------------------------------------------*/
static void
F_MCI(cfg_entry_t *cep)
{
DBGL(DL_STATE, (log(LL_DBG, "F_MCI: tx SETUP_RESP_ACCEPT")));
sendm_connect_resp(cep, cep->cdid, SETUP_RESP_ACCEPT, 0);
start_timer(cep, TIMEOUT_CONNECT_ACTIVE);
}
/*---------------------------------------------------------------------------*
* incoming connect active, call is now active
*---------------------------------------------------------------------------*/
static void
F_MCAI(cfg_entry_t *cep)
{
DBGL(DL_STATE, (log(LL_DBG, "F_MCAI: Connection active!")));
stop_timer(cep);
if((cep->dialin_reaction == REACT_ANSWER) &&
(cep->b1protocol == BPROT_NONE))
{
exec_answer(cep);
}
}
/*---------------------------------------------------------------------------*
* timeout
*---------------------------------------------------------------------------*/
static void
F_TIMO(cfg_entry_t *cep)
{
DBGL(DL_STATE, (log(LL_DBG, "F_TIMO: Timout occured!")));
sendm_disconnect_req(cep, (CAUSET_I4B << 8) | CAUSE_I4B_NORMAL);
cep->cdid = CDID_UNUSED;
}
/*---------------------------------------------------------------------------*
* incoming disconnect indication
*---------------------------------------------------------------------------*/
static void
F_IDIS(cfg_entry_t *cep)
{
DBGL(DL_STATE, (log(LL_DBG, "F_IDIS: disconnect indication")));
cep->cdid = CDID_UNUSED;
}
/*---------------------------------------------------------------------------*
* local disconnect request
*---------------------------------------------------------------------------*/
static void
F_DRQ(cfg_entry_t *cep)
{
DBGL(DL_STATE, (log(LL_DBG, "F_DRQ: local disconnect request")));
sendm_disconnect_req(cep, (CAUSET_I4B << 8) | CAUSE_I4B_NORMAL);
}
/*---------------------------------------------------------------------------*
* disconnect indication after local disconnect req
*---------------------------------------------------------------------------*/
static void
F_MDI(cfg_entry_t *cep)
{
DBGL(DL_STATE, (log(LL_DBG, "F_MDI: disconnect indication, local disconnected")));
cep->cdid = CDID_UNUSED;
}
/*---------------------------------------------------------------------------*
* local requested outgoing dial
*---------------------------------------------------------------------------*/
static void
F_DIAL(cfg_entry_t *cep)
{
DBGL(DL_STATE, (log(LL_DBG, "F_DIAL: local dial out request")));
if(cep->dialrandincr)
cep->randomtime = (random() & RANDOM_MASK) + cep->recoverytime;
cep->dial_count = 0;
select_first_dialno(cep);
sendm_connect_req(cep);
}
/*---------------------------------------------------------------------------*
* outgoing dial successfull
*---------------------------------------------------------------------------*/
static void
F_DOK(cfg_entry_t *cep)
{
DBGL(DL_STATE, (log(LL_DBG, "F_DOK: dial out ok")));
select_this_dialno(cep);
}
/*---------------------------------------------------------------------------*
* outgoing dial fail (ST_SUSE !!!)
*---------------------------------------------------------------------------*/
static void
F_DFL(cfg_entry_t *cep)
{
cep->last_release_time = time(NULL);
if(cep->dialouttype == DIALOUT_NORMAL)
{
cep->dial_count++;
if(cep->dial_count < cep->dialretries || cep->dialretries == -1) /* Added by FST <mailto:fsteevie@dds.nl> for unlimited dialing (sorry, but I needed it) */
{
/* inside normal retry cycle */
DBGL(DL_STATE, (log(LL_DBG, "F_DFL: dial fail, dial retry")));
select_next_dialno(cep);
cep->cdid = CDID_RESERVED;
cep->state = ST_DIALRTMRCHD;
return;
}
/* retries exhausted */
if(!cep->usedown)
{
DBGL(DL_STATE, (log(LL_DBG, "F_DFL: dial retry fail, dial retries exhausted")));
dialresponse(cep, DSTAT_TFAIL);
cep->cdid = CDID_UNUSED;
cep->dial_count = 0;
cep->state = ST_IDLE;
return;
}
/* interface up/down active */
cep->down_retry_count++;
if(cep->down_retry_count > cep->downtries)
{
/* set interface down */
DBGL(DL_STATE, (log(LL_DBG, "F_DFL: dial retry cycle fail, setting interface down!")));
dialresponse(cep, DSTAT_PFAIL);
if_down(cep);
cep->state = ST_DOWN;
}
else
{
/* enter new dial retry cycle */
DBGL(DL_STATE, (log(LL_DBG, "F_DFL: dial retry cycle fail, enter new retry cycle!")));
select_next_dialno(cep);
cep->state = ST_DIALRTMRCHD;
}
cep->dial_count = 0;
cep->cdid = CDID_RESERVED;
}
else /* cdp->dialouttype == DIALOUT_CALLEDBACK */
{
DBGL(DL_STATE, (log(LL_DBG, "F_DFL: calledback dial done, wait for incoming call")));
cep->cdid = CDID_RESERVED;
cep->state = ST_PCB_WAITCALL;
}
}
/*---------------------------------------------------------------------------*
* local requested outgoing dial
*---------------------------------------------------------------------------*/
static void
F_ACBW(cfg_entry_t *cep)
{
DBGL(DL_STATE, (log(LL_DBG, "F_ACBW: local callback, wait callback recovery time")));
if(cep->dialrandincr)
cep->randomtime = (random() & RANDOM_MASK) + cep->recoverytime;
cep->dial_count = 0;
cep->cdid = CDID_RESERVED;
}
/*---------------------------------------------------------------------------*
* active callback dialout retry (ST_SUSE !!!)
*---------------------------------------------------------------------------*/
static void
F_ACBR(cfg_entry_t *cep)
{
cep->dial_count++;
if(cep->dial_count < cep->dialretries || cep->dialretries == -1) /* Added by FST <mailto:fsteevie@dds.nl> for unlimited dialing (sorry, but I needed it) */
{
/* inside normal retry cycle */
DBGL(DL_STATE, (log(LL_DBG, "F_ACBR: dial fail, dial retry")));
select_next_dialno(cep);
cep->cdid = CDID_RESERVED;
cep->state = ST_ACB_DIALFAIL;
return;
}
/* retries exhausted */
if(!cep->usedown)
{
DBGL(DL_STATE, (log(LL_DBG, "F_ACBR: dial retry fail, dial retries exhausted")));
dialresponse(cep, DSTAT_TFAIL);
cep->cdid = CDID_UNUSED;
cep->dial_count = 0;
cep->state = ST_IDLE;
return;
}
/* interface up/down active */
cep->down_retry_count++;
if(cep->down_retry_count > cep->downtries)
{
/* set interface down */
DBGL(DL_STATE, (log(LL_DBG, "F_ACBR: dial retry cycle fail, setting interface down!")));
dialresponse(cep, DSTAT_PFAIL);
if_down(cep);
cep->state = ST_DOWN;
}
else
{
/* enter new dial retry cycle */
DBGL(DL_STATE, (log(LL_DBG, "F_ACBR: dial retry cycle fail, enter new retry cycle!")));
select_next_dialno(cep);
cep->state = ST_ACB_DIALFAIL;
}
cep->dial_count = 0;
cep->cdid = CDID_RESERVED;
}
/*---------------------------------------------------------------------------*
* local requested to send ALERT message
*---------------------------------------------------------------------------*/
static void
F_ALRT(cfg_entry_t *cep)
{
DBGL(DL_STATE, (log(LL_DBG, "F_ALRT: local send alert request")));
cep->alert_time = cep->alert;
sendm_alert_req(cep);
}
/*---------------------------------------------------------------------------*
* isdn daemon state transition table
*---------------------------------------------------------------------------*/
struct state_tab {
void(*func)(cfg_entry_t *cep); /* function to execute */
int newstate; /* next state */
} state_tab[N_EVENTS][N_STATES] = {
/* STATE: ST_IDLE ST_DIAL ST_DIALRTMRCHD ST_DIALRETRY ST_PCB_DIAL ST_PCB_DIALFAIL ST_PCB_WAITCALL ST_ACB_WAITDISC ST_ACB_WAITDIAL ST_ACB_DIAL ST_ACB_DIALFAIL ST_ACCEPTED ST_CONNECTED ST_WAITDISCI ST_DOWN ST_ALERT ST_ILLEGAL */
/* -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------*/
/* messages */
/* EV_MCI */{{F_MCI, ST_ACCEPTED}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_MCI, ST_ACCEPTED}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_MCI, ST_ACCEPTED}, {F_ill, ST_ILL}},
/* EV_MCAI */{{F_ill, ST_ILL}, {F_DOK, ST_CONNECTED}, {F_ill, ST_ILL}, {F_DOK, ST_CONNECTED}, {F_DOK, ST_CONNECTED}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_DOK, ST_CONNECTED}, {F_ill, ST_ILL}, {F_MCAI,ST_CONNECTED}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}},
/* EV_MDI */{{F_ill, ST_ILL}, {F_DFL, ST_SUSE}, {F_ill, ST_ILL}, {F_DFL, ST_SUSE}, {F_DFL, ST_SUSE}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ACBW,ST_ACB_WAITDIAL},{F_ill, ST_ILL}, {F_ACBR, ST_SUSE}, {F_ACBR,ST_SUSE}, {F_IDIS,ST_IDLE}, {F_IDIS,ST_IDLE}, {F_MDI, ST_IDLE}, {F_ill, ST_ILL}, {F_MDI, ST_IDLE}, {F_ill, ST_ILL}},
/* EV_MDO */{{F_DIAL,ST_DIAL}, {F_NcNa,ST_DIAL}, {F_NcNa,ST_DIALRTMRCHD},{F_NcNa,ST_DIALRETRY}, {F_NcNa,ST_PCB_DIAL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}},
/* local requests */
/* EV_TIMO */{{F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_TIMO,ST_IDLE}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}},
/* EV_DRQ */{{F_NcNa, ST_IDLE}, {F_DRQ, ST_WAITDISCI}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_DRQ, ST_WAITDISCI}, {F_NcNa,ST_WAITDISCI}, {F_NcNa, ST_DOWN}, {F_ill, ST_ILL}, {F_ill, ST_ILL}},
/* EV_CBRQ */{{F_NcNa,ST_ACB_WAITDIAL},{F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_NcNa,ST_ACB_WAITDIAL},{F_NcNa, ST_ACB_DIAL}, {F_NcNa,ST_ACB_DIALFAIL},{F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}},
/* EV_ALRT */{{F_ALRT,ST_ALERT}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}},
/* illegal */
/* EV_ILL */{{F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}}
};
/*---------------------------------------------------------------------------*
* event handler
*---------------------------------------------------------------------------*/
void
next_state(cfg_entry_t *cep, int event)
{
int currstate, newstate;
if(event > N_EVENTS)
{
log(LL_ERR, "next_state: event > N_EVENTS");
error_exit(1, "next_state: event > N_EVENTS");
}
currstate = cep->state;
if(currstate > N_STATES)
{
log(LL_ERR, "next_state: currstate > N_STATES");
error_exit(1, "next_state: currstate > N_STATES");
}
newstate = state_tab[event][currstate].newstate;
if(newstate > N_STATES)
{
log(LL_ERR, "next_state: newstate > N_STATES");
error_exit(1, "next_state: newstate > N_STATES");
}
if(newstate != ST_SUSE)
{
DBGL(DL_STATE, (log(LL_DBG, "FSM event [%s]: [%s => %s]", event_text[event],
state_text[currstate],
state_text[newstate])));
}
(*state_tab[event][currstate].func)(cep);
if(newstate == ST_ILL)
{
log(LL_ERR, "FSM ILLEGAL STATE, event=%s: oldstate=%s => newstate=%s]",
event_text[event],
state_text[currstate],
state_text[newstate]);
}
if(newstate == ST_SUSE)
{
DBGL(DL_STATE, (log(LL_DBG, "FSM (SUSE) event [%s]: [%s => %s]", event_text[event],
state_text[currstate],
state_text[cep->state])));
}
else
{
cep->state = newstate;
}
}
/*---------------------------------------------------------------------------*
* return pointer to current state description
*---------------------------------------------------------------------------*/
char *
printstate(cfg_entry_t *cep)
{
return((char *) state_text[cep->state]);
}
/* EOF */
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