yp_svc_udp.c revision 50479 
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
33#ifndef lint
34static const char rcsid[] =
35  "$FreeBSD: head/usr.sbin/ypserv/yp_svc_udp.c 50479 1999-08-28 01:35:59Z peter $";
36#endif /* not lint */
37
38#include <rpc/rpc.h>
39#include "yp_extern.h"
40
41/*
42 * XXX Must not diverge from what's in src/lib/libc/rpc/svc_udp.c
43 */
44
45/*
46 * kept in xprt->xp_p2
47 */
48struct svcudp_data {
49	u_int   su_iosz;	/* byte size of send.recv buffer */
50	u_long	su_xid;		/* transaction id */
51	XDR	su_xdrs;	/* XDR handle */
52	char	su_verfbody[MAX_AUTH_BYTES];	/* verifier body */
53	char * 	su_cache;	/* cached data, NULL if no cache */
54};
55#define	su_data(xprt)	((struct svcudp_data *)(xprt->xp_p2))
56
57/*
58 * We need to be able to manually set the transaction ID in the
59 * UDP transport handle, but the standard library offers us no way
60 * to do that. Hence we need this garbage.
61 */
62
63unsigned long
64svcudp_get_xid(xprt)
65	SVCXPRT *xprt;
66{
67	struct svcudp_data *su;
68
69	if (xprt == NULL)
70		return(0);
71	su = su_data(xprt);
72	return(su->su_xid);
73}
74
75unsigned long
76svcudp_set_xid(xprt, xid)
77	SVCXPRT *xprt;
78	unsigned long xid;
79{
80	struct svcudp_data *su;
81	unsigned long old_xid;
82
83	if (xprt == NULL)
84		return(0);
85	su = su_data(xprt);
86	old_xid = su->su_xid;
87	su->su_xid = xid;
88	return(old_xid);
89}
90