usr.sbin/i4b/isdnd/timer.c

   1 /*
   2  * Copyright (c) 1997, 1999 Hellmuth Michaelis. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  23  * SUCH DAMAGE.
  24  *
  25  *---------------------------------------------------------------------------
  26  *
  27  *      i4b daemon - timer/timing support routines
  28  *      ------------------------------------------
  29  *
  30  *      $Id: timer.c,v 1.17 1999/02/14 09:44:57 hm Exp $
  31  *
  32  *      last edit-date: [Sun Feb 14 10:12:32 1999]
  33  *
  34  *---------------------------------------------------------------------------*/
  35
  36 #include "isdnd.h"
  37
  38 static int hr_callgate(void);
  39 static void handle_reserved(cfg_entry_t *cep, time_t now);
  40 static void handle_active(cfg_entry_t *cep, time_t now);
  41 static void recover_illegal(cfg_entry_t *cep);
  42
  43 /*---------------------------------------------------------------------------*
  44  *      recover from illegal state
  45  *---------------------------------------------------------------------------*/
  46 static void
  47 recover_illegal(cfg_entry_t *cep)
  48 {
  49         log(LL_ERR, "recover_illegal: ERROR, entry %s attempting disconnect!", cep->name);
  50         sendm_disconnect_req(cep, (CAUSET_I4B << 8) | CAUSE_I4B_NORMAL);
  51         log(LL_ERR, "recover_illegal: ERROR, entry %s - reset state/cdid!", cep->name);
  52         cep->state = ST_IDLE;
  53         cep->cdid = CDID_UNUSED;
  54 }
  55
  56 /*---------------------------------------------------------------------------*
  57  *      start the timer
  58  *---------------------------------------------------------------------------*/
  59 void
  60 start_timer(cfg_entry_t *cep, int seconds)
  61 {
  62         cep->timerval = cep->timerremain = seconds;
  63 }
  64
  65 /*---------------------------------------------------------------------------*
  66  *      stop the timer
  67  *---------------------------------------------------------------------------*/
  68 void
  69 stop_timer(cfg_entry_t *cep)
  70 {
  71         cep->timerval = cep->timerremain = 0;
  72 }
  73
  74 /*---------------------------------------------------------------------------*
  75  *      callgate for handle_recovery()
  76  *---------------------------------------------------------------------------*/
  77 static int
  78 hr_callgate(void)
  79 {
  80         static int tv_first = 1;
  81         static struct timeval tv_last;
  82         struct timeval tv_now;
  83
  84         /* there must be 1 sec minimum between calls to this section */
  85
  86         if(tv_first)
  87         {
  88                 gettimeofday(&tv_last, NULL);
  89                 tv_first = 0;
  90         }
  91
  92         gettimeofday(&tv_now, NULL);
  93
  94         if((tv_now.tv_sec - tv_last.tv_sec) < 1)
  95         {
  96
  97                 DBGL(DL_TIME, (log(LL_DBG, "time < 1 - last %ld:%ld now %ld:%ld",
  98                                 tv_last.tv_sec, tv_last.tv_usec,
  99                                 tv_now.tv_sec, tv_now.tv_usec)));
 100                 return(1);
 101         }
 102         else if((tv_now.tv_sec - tv_last.tv_sec) == 1)
 103         {
 104                 if(((1000000 - tv_last.tv_usec) + tv_now.tv_usec) < 900000)
 105                 {
 106                         DBGL(DL_TIME, (log(LL_DBG, "time < 900000us - last %ld:%ld now %ld:%ld",
 107                                         tv_last.tv_sec, tv_last.tv_usec,
 108                                         tv_now.tv_sec, tv_now.tv_usec)));
 109                         return(1);
 110                 }
 111         }
 112
 113         DBGL(DL_TIME, (log(LL_DBG, "time OK! - last %ld:%ld now %ld:%ld",
 114                         tv_last.tv_sec, tv_last.tv_usec,
 115                         tv_now.tv_sec, tv_now.tv_usec)));
 116
 117         gettimeofday(&tv_last, NULL);
 118
 119         return(0);
 120 }
 121
 122 /*---------------------------------------------------------------------------*
 123  *      timeout, recovery and retry handling
 124  *---------------------------------------------------------------------------*/
 125 void
 126 handle_recovery(void)
 127 {
 128         cfg_entry_t *cep = NULL;
 129         int i;
 130         time_t now;
 131
 132         if(hr_callgate())       /* last call to handle_recovery < 1 sec ? */
 133                 return;         /* yes, exit */
 134
 135         now = time(NULL);       /* get current time */
 136
 137         /* walk thru all entries, look for work to do */
 138
 139         for(i=0; i < nentries; i++)
 140         {
 141                 cep = &cfg_entry_tab[i];        /* ptr to config entry */
 142
 143                 switch(cep->cdid)
 144                 {
 145                         case CDID_UNUSED:               /* entry unused */
 146                                 continue;
 147                                 break;
 148
 149                         case CDID_RESERVED:             /* entry reserved */
 150                                 handle_reserved(cep, now);
 151                                 break;
 152
 153                         default:                        /* entry in use */
 154                                 handle_active(cep, now);
 155                                 break;
 156                 }
 157         }
 158 }
 159
 160 /*---------------------------------------------------------------------------*
 161  *      timeout, recovery and retry handling for active entry
 162  *---------------------------------------------------------------------------*/
 163 static void
 164 handle_active(cfg_entry_t *cep, time_t now)
 165 {
 166         switch(cep->state)
 167         {
 168                 case ST_ACCEPTED:
 169                         if(cep->timerval && (--(cep->timerremain)) <= 0)
 170                         {
 171                                 DBGL(DL_RCVRY, (log(LL_DBG, "handle_active: entry %s, TIMEOUT !!!", cep->name)));
 172                                 cep->timerval = cep->timerremain = 0;
 173                                 next_state(cep, EV_TIMO);
 174                         }
 175                         break;
 176
 177                 case ST_ALERT:
 178                         if(cep->alert_time > 0)
 179                         {
 180                                 cep->alert_time--;
 181                         }
 182                         else
 183                         {
 184                                 log(LL_CHD, "%05d %s answering: incoming call from %s to %s",
 185                                         cep->cdid, cep->name,
 186                                         cep->real_phone_incoming,
 187                                         cep->local_phone_incoming);
 188                                 next_state(cep, EV_MCI);
 189                         }
 190                         break;
 191
 192                 case ST_ILL:
 193                         recover_illegal(cep);
 194                         break;
 195
 196                 default:
 197                         /* check hangup flag: if active, close connection */
 198
 199                         if(cep->hangup)
 200                         {
 201                                 DBGL(DL_RCVRY, (log(LL_DBG, "handle_active: entry %s, hangup request!", cep->name)));
 202                                 cep->hangup = 0;
 203                                 next_state(cep, EV_DRQ);
 204                         }
 205
 206                         /*
 207                          * if shorthold mode is rates based, check if
 208                          * we entered a time with a new unit length
 209                          */
 210
 211                         if(cep->unitlengthsrc == ULSRC_RATE)
 212                         {
 213                                 int connecttime = (int)difftime(now, cep->connect_time);
 214
 215                                 if((connecttime > 1) &&
 216                                    (connecttime % 60))
 217                                 {
 218                                         int newrate = get_current_rate(cep, 0);
 219
 220                                         if(newrate != cep->unitlength)
 221                                         {
 222                                                 DBGL(DL_MSG, (log(LL_DBG, "handle_active: rates unit length updated %d -> %d", cep->unitlength, newrate)));
 223
 224                                                 cep->unitlength = newrate;
 225
 226                                                 unitlen_chkupd(cep);
 227                                         }
 228                                 }
 229                         }
 230                         break;
 231         }
 232 }
 233
 234 /*---------------------------------------------------------------------------*
 235  *      timeout, recovery and retry handling for reserved entry
 236  *---------------------------------------------------------------------------*/
 237 static void
 238 handle_reserved(cfg_entry_t *cep, time_t now)
 239 {
 240         time_t waittime;
 241
 242         switch(cep->state)
 243         {
 244                 case ST_DIALRTMRCHD:    /* wait for dial retry time reached */
 245
 246                         if(cep->dialrandincr)
 247                                 waittime = cep->randomtime;
 248                         else
 249                                 waittime = cep->recoverytime;
 250
 251
 252                         if(now > (cep->last_dial_time + waittime))
 253                         {
 254                                 DBGL(DL_RCVRY, (log(LL_DBG, "handle_reserved: entry %s, dial retry request!", cep->name)));
 255                                 cep->state = ST_DIALRETRY;
 256
 257                                 if((cep->cdid = get_cdid()) == 0)
 258                                 {
 259                                         log(LL_ERR, "handle_reserved: dialretry get_cdid() returned 0!");
 260                                         cep->state = ST_IDLE;
 261                                         cep->cdid = CDID_UNUSED;
 262                                         return;
 263                                 }
 264
 265                                 if((setup_dialout(cep)) == GOOD)
 266                                 {
 267                                         sendm_connect_req(cep);
 268                                 }
 269                                 else
 270                                 {
 271                                         log(LL_ERR, "handle_reserved: dialretry setup_dialout returned ERROR!");
 272                                         cep->state = ST_IDLE;
 273                                         cep->cdid = CDID_UNUSED;
 274                                         return;
 275                                 }
 276                         }
 277                         break;
 278
 279
 280                 case ST_ACB_WAITDIAL:   /* active callback wait for time between disconnect and dial */
 281
 282                         if(now > (cep->last_release_time + cep->callbackwait))
 283                         {
 284                                 DBGL(DL_RCVRY, (log(LL_DBG, "handle_reserved: entry %s, callback dial!", cep->name)));
 285                                 cep->state = ST_ACB_DIAL;
 286
 287                                 if((cep->cdid = get_cdid()) == 0)
 288                                 {
 289                                         log(LL_ERR, "handle_reserved: callback get_cdid() returned 0!");
 290                                         cep->state = ST_IDLE;
 291                                         cep->cdid = CDID_UNUSED;
 292                                         return;
 293                                 }
 294
 295                                 select_first_dialno(cep);
 296
 297                                 if((setup_dialout(cep)) == GOOD)
 298                                 {
 299                                         sendm_connect_req(cep);
 300                                 }
 301                                 else
 302                                 {
 303                                         log(LL_ERR, "handle_reserved: callback setup_dialout returned ERROR!");
 304                                         cep->state = ST_IDLE;
 305                                         cep->cdid = CDID_UNUSED;
 306                                         return;
 307                                 }
 308                         }
 309                         break;
 310
 311                 case ST_ACB_DIALFAIL:   /* callback to remote failed */
 312
 313                         if(cep->dialrandincr)
 314                                 waittime = cep->randomtime + cep->recoverytime;
 315                         else
 316                                 waittime = cep->recoverytime;
 317
 318                         if(now > (cep->last_release_time + waittime))
 319                         {
 320                                 DBGL(DL_RCVRY, (log(LL_DBG, "handle_reserved: entry %s, callback dial retry request!", cep->name)));
 321                                 cep->state = ST_ACB_DIAL;
 322
 323                                 if((cep->cdid = get_cdid()) == 0)
 324                                 {
 325                                         log(LL_ERR, "handle_reserved: callback dialretry get_cdid() returned 0!");
 326                                         cep->state = ST_IDLE;
 327                                         cep->cdid = CDID_UNUSED;
 328                                         return;
 329                                 }
 330
 331                                 if((setup_dialout(cep)) == GOOD)
 332                                 {
 333                                         sendm_connect_req(cep);
 334                                 }
 335                                 else
 336                                 {
 337                                         log(LL_ERR, "handle_reserved: callback dialretry setup_dialout returned ERROR!");
 338                                         cep->state = ST_IDLE;
 339                                         cep->cdid = CDID_UNUSED;
 340                                         return;
 341                                 }
 342                         }
 343                         break;
 344
 345                 case ST_PCB_WAITCALL:   /* wait for remote calling back */
 346
 347                         if(now > (cep->last_release_time + cep->calledbackwait))
 348                         {
 349                                 cep->dial_count++;
 350
 351                                 if(cep->dial_count < cep->dialretries)
 352                                 {
 353                                         /* inside normal retry cycle */
 354
 355                                         DBGL(DL_RCVRY, (log(LL_DBG, "handle_reserved: entry %s, retry calledback dial #%d!",
 356                                                 cep->name, cep->dial_count)));
 357                                         cep->state = ST_PCB_DIAL;
 358
 359                                         if((cep->cdid = get_cdid()) == 0)
 360                                         {
 361                                                 log(LL_ERR, "handle_reserved: calledback get_cdid() returned 0!");
 362                                                 cep->state = ST_IDLE;
 363                                                 cep->cdid = CDID_UNUSED;
 364                                                 return;
 365                                         }
 366                                         select_next_dialno(cep);
 367
 368                                         if((setup_dialout(cep)) == GOOD)
 369                                         {
 370                                                 sendm_connect_req(cep);
 371                                         }
 372                                         else
 373                                         {
 374                                                 log(LL_ERR, "handle_reserved: calledback setup_dialout returned ERROR!");
 375                                                 cep->state = ST_IDLE;
 376                                                 cep->cdid = CDID_UNUSED;
 377                                                 return;
 378                                         }
 379                                 }
 380                                 else
 381                                 {
 382                                         /* retries exhausted */
 383
 384                                         DBGL(DL_RCVRY, (log(LL_DBG, "handle_reserved: calledback dial retries exhausted")));
 385                                         dialresponse(cep, DSTAT_TFAIL);
 386                                         cep->cdid = CDID_UNUSED;
 387                                         cep->dial_count = 0;
 388                                         cep->state = ST_IDLE;
 389                                 }
 390                         }
 391                         break;
 392
 393                 case ST_DOWN:   /* interface was taken down */
 394
 395                         if(now > (cep->went_down_time + cep->downtime))
 396                         {
 397                                 DBGL(DL_RCVRY, (log(LL_DBG, "handle_reserved: taking %s%d up", bdrivername(cep->usrdevicename), cep->usrdeviceunit)));
 398                                 if_up(cep);
 399                                 cep->state = ST_IDLE;
 400                                 cep->cdid = CDID_UNUSED;
 401                         }
 402                         break;
 403
 404                 case ST_ILL:    /* illegal state reached, recover ! */
 405
 406                         recover_illegal(cep);
 407                         break;
 408         }
 409 }
 410
 411 /* EOF */