1: /*      $NetBSD: ctl_transact.c,v 1.6 2003/06/11 12:00:22 wiz Exp $  */
    2: /*
    3:  * Copyright (c) 1983-2003, Regents of the University of California.
    4:  * All rights reserved.
    5:  * 
    6:  * Redistribution and use in source and binary forms, with or without 
    7:  * modification, are permitted provided that the following conditions are 
    8:  * met:
    9:  * 
   10:  * + Redistributions of source code must retain the above copyright 
   11:  *   notice, this list of conditions and the following disclaimer.
   12:  * + Redistributions in binary form must reproduce the above copyright 
   13:  *   notice, this list of conditions and the following disclaimer in the 
   14:  *   documentation and/or other materials provided with the distribution.
   15:  * + Neither the name of the University of California, San Francisco nor 
   16:  *   the names of its contributors may be used to endorse or promote 
   17:  *   products derived from this software without specific prior written 
   18:  *   permission.
   19:  * 
   20:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS 
   21:  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 
   22:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 
   23:  * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
   24:  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
   25:  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
   26:  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
   27:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
   28:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
   29:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
   30:  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   31:  */
   32: 
   33: #include "bsd.h"
   34: 
   35: #if     defined(TALK_43) || defined(TALK_42)
   36: 
   37: #include <sys/cdefs.h>
   38: #ifndef lint
   39: #if 0
   40: static char sccsid[] = "@(#)ctl_transact.c      5.2 (Berkeley) 3/13/86";
   41: #else
   42: __RCSID("$NetBSD: ctl_transact.c,v 1.6 2003/06/11 12:00:22 wiz Exp $");
   43: #endif
   44: #endif /* not lint */
   45: 
   46: #include <sys/time.h>
   47: #include <unistd.h>
   48: #include "hunt.h"
   49: #include "talk_ctl.h"
   50: 
   51: #define CTL_WAIT 2      /* time to wait for a response, in seconds */
   52: #define MAX_RETRY 5
   53: 
   54: /*
   55:  * SOCKDGRAM is unreliable, so we must repeat messages if we have
   56:  * not received an acknowledgement within a reasonable amount
   57:  * of time
   58:  */
   59: void
   60: ctl_transact(target, msg, type, rp)
   61:         struct in_addr target;
   62:         CTL_MSG msg;
   63:         int type;
   64:         CTL_RESPONSE *rp;
   65: {
   66:         struct pollfd set[1];
   67:         int nready, cc, retries;
   68: 
   69:         nready = 0;
   70:         msg.type = type;
   71:         daemon_addr.sin_addr = target;
   72:         daemon_addr.sin_port = daemon_port;
   73:         set[0].fd = ctl_sockt;
   74:         set[0].events = POLLIN;
   75: 
   76:         /*
   77:          * Keep sending the message until a response of
   78:          * the proper type is obtained.
   79:          */
   80:         do {
   81:                 /* resend message until a response is obtained */
   82:                 for (retries = MAX_RETRY; retries > 0; retries -= 1) {
   83:                         cc = sendto(ctl_sockt, (char *)&msg, sizeof (msg), 0,
   84:                                 &daemon_addr, sizeof (daemon_addr));
   85:                         if (cc != sizeof (msg)) {
   86:                                 if (errno == EINTR)
   87:                                         continue;
   88:                                 p_error("Error on write to talk daemon");
   89:                         }
   90:                         nready = poll(set, 1, CTL_WAIT * 1000);
   91:                         if (nready < 0) {
   92:                                 if (errno == EINTR)
   93:                                         continue;
   94:                                 p_error("Error waiting for daemon response");
   95:                         }
   96:                         if (nready != 0)
   97:                                 break;
   98:                 }
   99:                 if (retries <= 0)
  100:                         break;
  101:                 /*
  102:                  * Keep reading while there are queued messages 
  103:                  * (this is not necessary, it just saves extra
  104:                  * request/acknowledgements being sent)
  105:                  */
  106:                 do {
  107:                         cc = recv(ctl_sockt, (char *)rp, sizeof (*rp), 0);
  108:                         if (cc < 0) {
  109:                                 if (errno == EINTR)
  110:                                         continue;
  111:                                 p_error("Error on read from talk daemon");
  112:                         }
  113:                         /* an immediate poll */
  114:                         nready = poll(set, 1, 0);
  115:                 } while (nready > 0 && (
  116: #ifdef  TALK_43
  117:                     rp->vers != TALK_VERSION ||
  118: #endif
  119:                     rp->type != type));
  120:         } while (
  121: #ifdef  TALK_43
  122:             rp->vers != TALK_VERSION ||
  123: #endif
  124:             rp->type != type);
  125:         rp->id_num = ntohl(rp->id_num);
  126: #ifdef  TALK_43
  127:         rp->addr.sa_family = ntohs(rp->addr.sa_family);
  128: # else
  129:         rp->addr.sin_family = ntohs(rp->addr.sin_family);
  130: # endif
  131: }
  132: #endif