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freebsd-dev/usr.sbin/i4b/isdnd/timer.c

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/*
* Copyright (c) 1997, 2002 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.
*
*---------------------------------------------------------------------------
*
* i4b daemon - timer/timing support routines
* ------------------------------------------
*
* $FreeBSD$
*
* last edit-date: [Sat May 13 13:13:13 2006]
*
*---------------------------------------------------------------------------*/
#include "isdnd.h"
static int hr_callgate(void);
static void handle_reserved(cfg_entry_t *cep, time_t now);
static void handle_active(cfg_entry_t *cep, time_t now);
static void recover_illegal(cfg_entry_t *cep);
/*---------------------------------------------------------------------------*
* recover from illegal state
*---------------------------------------------------------------------------*/
static void
recover_illegal(cfg_entry_t *cep)
{
llog(LL_ERR, "recover_illegal: ERROR, entry %s attempting disconnect!", cep->name);
sendm_disconnect_req(cep, (CAUSET_I4B << 8) | CAUSE_I4B_NORMAL);
llog(LL_ERR, "recover_illegal: ERROR, entry %s - reset state/cdid!", cep->name);
cep->state = ST_IDLE;
cep->cdid = CDID_UNUSED;
}
/*---------------------------------------------------------------------------*
* start the timer
*---------------------------------------------------------------------------*/
void
start_timer(cfg_entry_t *cep, int seconds)
{
cep->timerval = cep->timerremain = seconds;
}
/*---------------------------------------------------------------------------*
* stop the timer
*---------------------------------------------------------------------------*/
void
stop_timer(cfg_entry_t *cep)
{
cep->timerval = cep->timerremain = 0;
}
/*---------------------------------------------------------------------------*
* callgate for handle_recovery()
*---------------------------------------------------------------------------*/
static int
hr_callgate(void)
{
static int tv_first = 1;
static struct timeval tv_last;
struct timeval tv_now;
/* there must be 1 sec minimum between calls to this section */
if(tv_first)
{
gettimeofday(&tv_last, NULL);
tv_first = 0;
}
gettimeofday(&tv_now, NULL);
if((tv_now.tv_sec - tv_last.tv_sec) < 1)
{
DBGL(DL_TIME, (llog(LL_DBG, "time < 1 - last %ld:%ld now %ld:%ld",
tv_last.tv_sec, tv_last.tv_usec,
tv_now.tv_sec, tv_now.tv_usec)));
return(1);
}
else if((tv_now.tv_sec - tv_last.tv_sec) == 1)
{
if(((1000000 - tv_last.tv_usec) + tv_now.tv_usec) < 900000)
{
DBGL(DL_TIME, (llog(LL_DBG, "time < 900000us - last %ld:%ld now %ld:%ld",
tv_last.tv_sec, tv_last.tv_usec,
tv_now.tv_sec, tv_now.tv_usec)));
return(1);
}
}
DBGL(DL_TIME, (llog(LL_DBG, "time OK! - last %ld:%ld now %ld:%ld",
tv_last.tv_sec, tv_last.tv_usec,
tv_now.tv_sec, tv_now.tv_usec)));
gettimeofday(&tv_last, NULL);
return(0);
}
/*---------------------------------------------------------------------------*
* timeout, recovery and retry handling
*---------------------------------------------------------------------------*/
void
handle_recovery(void)
{
cfg_entry_t *cep = NULL;
int i;
time_t now;
if(hr_callgate()) /* last call to handle_recovery < 1 sec ? */
return; /* yes, exit */
now = time(NULL); /* get current time */
/* walk thru all entries, look for work to do */
for(i=0; i < nentries; i++)
{
cep = &cfg_entry_tab[i]; /* ptr to config entry */
if(cep->budget_callbackperiod && cep->budget_callbackncalls)
{
if(cep->budget_callbackperiod_time <= now)
{
DBGL(DL_BDGT, (llog(LL_DBG, "%s: new cback-budget-period (%d s, %d left)",
cep->name, cep->budget_callbackperiod, cep->budget_callbackncalls_cnt)));
cep->budget_callbackperiod_time = now + cep->budget_callbackperiod;
cep->budget_callbackncalls_cnt = cep->budget_callbackncalls;
}
}
if(cep->budget_calloutperiod && cep->budget_calloutncalls)
{
if(cep->budget_calloutperiod_time <= now)
{
DBGL(DL_BDGT, (llog(LL_DBG, "%s: new cout-budget-period (%d s, %d left)",
cep->name, cep->budget_calloutperiod, cep->budget_calloutncalls_cnt)));
cep->budget_calloutperiod_time = now + cep->budget_calloutperiod;
cep->budget_calloutncalls_cnt = cep->budget_calloutncalls;
}
}
switch(cep->cdid)
{
case CDID_UNUSED: /* entry unused */
continue;
break;
case CDID_RESERVED: /* entry reserved */
handle_reserved(cep, now);
break;
default: /* entry in use */
handle_active(cep, now);
break;
}
}
}
/*---------------------------------------------------------------------------*
* timeout, recovery and retry handling for active entry
*---------------------------------------------------------------------------*/
static void
handle_active(cfg_entry_t *cep, time_t now)
{
switch(cep->state)
{
case ST_ACCEPTED:
if(cep->timerval && (--(cep->timerremain)) <= 0)
{
DBGL(DL_RCVRY, (llog(LL_DBG, "handle_active: entry %s, TIMEOUT !!!", cep->name)));
cep->timerval = cep->timerremain = 0;
next_state(cep, EV_TIMO);
}
break;
case ST_ALERT:
if(cep->alert_time > 0)
{
cep->alert_time--;
}
else
{
llog(LL_CHD, "%05d %s answering: incoming call from %s to %s",
cep->cdid, cep->name,
cep->real_phone_incoming.number,
cep->local_phone_incoming.number);
next_state(cep, EV_MCI);
}
break;
case ST_ILL:
recover_illegal(cep);
break;
default:
/* check hangup flag: if active, close connection */
if(cep->hangup)
{
DBGL(DL_RCVRY, (llog(LL_DBG, "handle_active: entry %s, hangup request!", cep->name)));
cep->hangup = 0;
next_state(cep, EV_DRQ);
}
/* check maximum connect time reached */
if(cep->maxconnecttime > 0 && cep->connect_time > 0)
{
int connecttime = (int)difftime(now, cep->connect_time);
if(connecttime > cep->maxconnecttime)
{
DBGL(DL_RCVRY, (llog(LL_DBG,
"handle_active: entry %s, maxconnecttime %d reached!",
cep->name, cep->maxconnecttime)));
next_state(cep, EV_DRQ);
}
}
/*
* if shorthold mode is rates based, check if
* we entered a time with a new unit length
*/
if(cep->unitlengthsrc == ULSRC_RATE)
{
int connecttime = (int)difftime(now, cep->connect_time);
if((connecttime > 1) &&
(connecttime % 60))
{
int newrate = get_current_rate(cep, 0);
if(newrate != cep->unitlength)
{
DBGL(DL_MSG, (llog(LL_DBG, "handle_active: rates unit length updated %d -> %d", cep->unitlength, newrate)));
cep->unitlength = newrate;
unitlen_chkupd(cep);
}
}
}
break;
}
}
/*---------------------------------------------------------------------------*
* timeout, recovery and retry handling for reserved entry
*---------------------------------------------------------------------------*/
static void
handle_reserved(cfg_entry_t *cep, time_t now)
{
time_t waittime;
switch(cep->state)
{
case ST_DIALRTMRCHD: /* wait for dial retry time reached */
if(cep->dialrandincr)
waittime = cep->randomtime;
else
waittime = cep->recoverytime;
if(now > (cep->last_dial_time + waittime))
{
DBGL(DL_RCVRY, (llog(LL_DBG, "handle_reserved: entry %s, dial retry request!", cep->name)));
cep->state = ST_DIALRETRY;
if((cep->cdid = get_cdid()) == 0)
{
llog(LL_ERR, "handle_reserved: dialretry get_cdid() returned 0!");
cep->state = ST_IDLE;
cep->cdid = CDID_UNUSED;
return;
}
if((setup_dialout(cep)) == GOOD)
{
sendm_connect_req(cep);
}
else
{
llog(LL_ERR, "handle_reserved: dialretry setup_dialout returned ERROR!");
cep->state = ST_IDLE;
cep->cdid = CDID_UNUSED;
return;
}
}
break;
case ST_ACB_WAITDIAL: /* active callback wait for time between disconnect and dial */
if(now > (cep->last_release_time + cep->callbackwait))
{
DBGL(DL_RCVRY, (llog(LL_DBG, "handle_reserved: entry %s, callback dial!", cep->name)));
cep->state = ST_ACB_DIAL;
if((cep->cdid = get_cdid()) == 0)
{
llog(LL_ERR, "handle_reserved: callback get_cdid() returned 0!");
cep->state = ST_IDLE;
cep->cdid = CDID_UNUSED;
return;
}
select_first_dialno(cep);
if((setup_dialout(cep)) == GOOD)
{
sendm_connect_req(cep);
}
else
{
llog(LL_ERR, "handle_reserved: callback setup_dialout returned ERROR!");
cep->state = ST_IDLE;
cep->cdid = CDID_UNUSED;
return;
}
}
break;
case ST_ACB_DIALFAIL: /* callback to remote failed */
if(cep->dialrandincr)
waittime = cep->randomtime + cep->recoverytime;
else
waittime = cep->recoverytime;
if(now > (cep->last_release_time + waittime))
{
DBGL(DL_RCVRY, (llog(LL_DBG, "handle_reserved: entry %s, callback dial retry request!", cep->name)));
cep->state = ST_ACB_DIAL;
if((cep->cdid = get_cdid()) == 0)
{
llog(LL_ERR, "handle_reserved: callback dialretry get_cdid() returned 0!");
cep->state = ST_IDLE;
cep->cdid = CDID_UNUSED;
return;
}
if((setup_dialout(cep)) == GOOD)
{
sendm_connect_req(cep);
}
else
{
llog(LL_ERR, "handle_reserved: callback dialretry setup_dialout returned ERROR!");
cep->state = ST_IDLE;
cep->cdid = CDID_UNUSED;
return;
}
}
break;
case ST_PCB_WAITCALL: /* wait for remote calling back */
if(now > (cep->last_release_time + cep->calledbackwait))
{
cep->dial_count++;
if(cep->dial_count < cep->dialretries)
{
/* inside normal retry cycle */
DBGL(DL_RCVRY, (llog(LL_DBG, "handle_reserved: entry %s, retry calledback dial #%d!",
cep->name, cep->dial_count)));
cep->state = ST_PCB_DIAL;
if((cep->cdid = get_cdid()) == 0)
{
llog(LL_ERR, "handle_reserved: calledback get_cdid() returned 0!");
cep->state = ST_IDLE;
cep->cdid = CDID_UNUSED;
return;
}
select_next_dialno(cep);
if((setup_dialout(cep)) == GOOD)
{
sendm_connect_req(cep);
}
else
{
llog(LL_ERR, "handle_reserved: calledback setup_dialout returned ERROR!");
cep->state = ST_IDLE;
cep->cdid = CDID_UNUSED;
return;
}
}
else
{
/* retries exhausted */
DBGL(DL_RCVRY, (llog(LL_DBG, "handle_reserved: calledback dial retries exhausted")));
dialresponse(cep, DSTAT_TFAIL);
cep->cdid = CDID_UNUSED;
cep->dial_count = 0;
cep->state = ST_IDLE;
}
}
break;
case ST_DOWN: /* interface was taken down */
if(now > (cep->went_down_time + cep->downtime))
{
DBGL(DL_RCVRY, (llog(LL_DBG, "handle_reserved: taking %s%d up", bdrivername(cep->usrdevicename), cep->usrdeviceunit)));
if_up(cep);
cep->state = ST_IDLE;
cep->cdid = CDID_UNUSED;
}
break;
case ST_ILL: /* illegal state reached, recover ! */
recover_illegal(cep);
break;
}
}
/* EOF */
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