usr.sbin/ypserv/yp_svc_udp.c

   1 /*
   2  * Copyright (c) 1996
   3  *      Bill Paul <wpaul@ctr.columbia.edu>.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by Bill Paul.
  16  * 4. Neither the name of the author nor the names of any co-contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * $FreeBSD: src/usr.sbin/ypserv/yp_svc_udp.c,v 1.5 1999/08/28 01:21:14 peter Exp $
  33  * $DragonFly: src/usr.sbin/ypserv/yp_svc_udp.c,v 1.3 2004/03/31 23:20:22 cpressey Exp $
  34  */
  35
  36 #include <rpc/rpc.h>
  37 #include "yp_extern.h"
  38
  39 /*
  40  * XXX Must not diverge from what's in src/lib/libc/rpc/svc_udp.c
  41  */
  42
  43 /*
  44  * kept in xprt->xp_p2
  45  */
  46 struct svcudp_data {
  47         u_int   su_iosz;        /* byte size of send.recv buffer */
  48         u_long  su_xid;         /* transaction id */
  49         XDR     su_xdrs;        /* XDR handle */
  50         char    su_verfbody[MAX_AUTH_BYTES];    /* verifier body */
  51         char *  su_cache;       /* cached data, NULL if no cache */
  52 };
  53 #define su_data(xprt)   ((struct svcudp_data *)(xprt->xp_p2))
  54
  55 /*
  56  * We need to be able to manually set the transaction ID in the
  57  * UDP transport handle, but the standard library offers us no way
  58  * to do that. Hence we need this garbage.
  59  */
  60
  61 unsigned long
  62 svcudp_get_xid(SVCXPRT *xprt)
  63 {
  64         struct svcudp_data *su;
  65
  66         if (xprt == NULL)
  67                 return(0);
  68         su = su_data(xprt);
  69         return(su->su_xid);
  70 }
  71
  72 unsigned long
  73 svcudp_set_xid(SVCXPRT *xprt, unsigned long xid)
  74 {
  75         struct svcudp_data *su;
  76         unsigned long old_xid;
  77
  78         if (xprt == NULL)
  79                 return(0);
  80         su = su_data(xprt);
  81         old_xid = su->su_xid;
  82         su->su_xid = xid;
  83         return(old_xid);
  84 }