1/*	$NetBSD: misc_rpc.c,v 1.1.1.2 2009/03/20 20:26:55 christos Exp $	*/
2
3/*
4 * Copyright (c) 1997-2009 Erez Zadok
5 * Copyright (c) 1990 Jan-Simon Pendry
6 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
7 * Copyright (c) 1990 The Regents of the University of California.
8 * All rights reserved.
9 *
10 * This code is derived from software contributed to Berkeley by
11 * Jan-Simon Pendry at Imperial College, London.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 *    notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 *    notice, this list of conditions and the following disclaimer in the
20 *    documentation and/or other materials provided with the distribution.
21 * 3. All advertising materials mentioning features or use of this software
22 *    must display the following acknowledgment:
23 *      This product includes software developed by the University of
24 *      California, Berkeley and its contributors.
25 * 4. Neither the name of the University nor the names of its contributors
26 *    may be used to endorse or promote products derived from this software
27 *    without specific prior written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
32 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 * SUCH DAMAGE.
40 *
41 *
42 * File: am-utils/libamu/misc_rpc.c
43 *
44 */
45
46/*
47 * Additions to Sun RPC.
48 */
49
50#ifdef HAVE_CONFIG_H
51# include <config.h>
52#endif /* HAVE_CONFIG_H */
53#include <am_defs.h>
54#include <amu.h>
55
56/*
57 * Some systems renamed _seterr_reply to __seterr_reply (with two
58 * leading underscores)
59 */
60#if !defined(HAVE__SETERR_REPLY) && defined(HAVE___SETERR_REPLY)
61# define _seterr_reply	__seterr_reply
62#endif /* !defined(HAVE__SETERR_REPLY) && defined(HAVE___SETERR_REPLY) */
63
64
65void
66rpc_msg_init(struct rpc_msg *mp, u_long prog, u_long vers, u_long proc)
67{
68  /*
69   * Initialize the message
70   */
71  memset((voidp) mp, 0, sizeof(*mp));
72  mp->rm_xid = 0;
73  mp->rm_direction = CALL;
74  mp->rm_call.cb_rpcvers = RPC_MSG_VERSION;
75  mp->rm_call.cb_prog = prog;
76  mp->rm_call.cb_vers = vers;
77  mp->rm_call.cb_proc = proc;
78}
79
80
81/*
82 * Field reply to call to mountd
83 */
84int
85pickup_rpc_reply(voidp pkt, int len, voidp where, XDRPROC_T_TYPE where_xdr)
86{
87  XDR reply_xdr;
88  int ok;
89  struct rpc_err err;
90  struct rpc_msg reply_msg;
91  int error = 0;
92
93  /* memset((voidp) &err, 0, sizeof(err)); */
94  memset((voidp) &reply_msg, 0, sizeof(reply_msg));
95  memset((voidp) &reply_xdr, 0, sizeof(reply_xdr));
96
97  reply_msg.acpted_rply.ar_results.where = where;
98  reply_msg.acpted_rply.ar_results.proc = where_xdr;
99
100  xdrmem_create(&reply_xdr, pkt, len, XDR_DECODE);
101
102  ok = xdr_replymsg(&reply_xdr, &reply_msg);
103  if (!ok) {
104    error = EIO;
105    goto drop;
106  }
107  _seterr_reply(&reply_msg, &err);
108  if (err.re_status != RPC_SUCCESS) {
109    error = EIO;
110    goto drop;
111  }
112
113drop:
114  if (reply_msg.rm_reply.rp_stat == MSG_ACCEPTED &&
115      reply_msg.acpted_rply.ar_verf.oa_base) {
116    reply_xdr.x_op = XDR_FREE;
117    (void) xdr_opaque_auth(&reply_xdr,
118			   &reply_msg.acpted_rply.ar_verf);
119  }
120  xdr_destroy(&reply_xdr);
121
122  return error;
123}
124
125
126int
127make_rpc_packet(char *buf, int buflen, u_long proc, struct rpc_msg *mp, voidp arg, XDRPROC_T_TYPE arg_xdr, AUTH *auth)
128{
129  XDR msg_xdr;
130  int len;
131  /*
132   * Never cast pointers between different integer types, it breaks badly
133   * on big-endian platforms if those types have different sizes.
134   *
135   * Cast to a local variable instead, and use that variable's address.
136   */
137  enum_t local_proc = (enum_t) proc;
138
139  xdrmem_create(&msg_xdr, buf, buflen, XDR_ENCODE);
140
141  /*
142   * Basic protocol header
143   */
144  if (!xdr_callhdr(&msg_xdr, mp))
145    return -EIO;
146
147  /*
148   * Called procedure number
149   */
150  if (!xdr_enum(&msg_xdr, &local_proc))
151    return -EIO;
152
153  /*
154   * Authorization
155   */
156  if (!AUTH_MARSHALL(auth, &msg_xdr))
157    return -EIO;
158
159  /*
160   * Arguments
161   */
162  if (!(*arg_xdr) (&msg_xdr, arg))
163    return -EIO;
164
165  /*
166   * Determine length
167   */
168  len = xdr_getpos(&msg_xdr);
169
170  /*
171   * Throw away xdr
172   */
173  xdr_destroy(&msg_xdr);
174
175  return len;
176}
177
178
179/* get uid/gid from RPC credentials */
180int
181getcreds(struct svc_req *rp, uid_t *u, gid_t *g, SVCXPRT *nfsxprt)
182{
183  struct authunix_parms *aup = (struct authunix_parms *) NULL;
184#ifdef HAVE_RPC_AUTH_DES_H
185  struct authdes_cred *adp;
186#endif /* HAVE_RPC_AUTH_DES_H */
187
188  switch (rp->rq_cred.oa_flavor) {
189
190  case AUTH_UNIX:
191    aup = (struct authunix_parms *) rp->rq_clntcred;
192    *u = aup->aup_uid;
193    *g = aup->aup_gid;
194    break;
195
196#ifdef HAVE_RPC_AUTH_DES_H
197  case AUTH_DES:
198    adp = (struct authdes_cred *) rp->rq_clntcred;
199    *g = INVALIDID;		/* some unknown group id */
200    if (sscanf(adp->adc_fullname.name, "unix.%lu@", (u_long *) u) == 1)
201        break;
202    /* fall through */
203#endif /* HAVE_RPC_AUTH_DES_H */
204
205  default:
206    *u = *g = INVALIDID;	/* just in case */
207    svcerr_weakauth(nfsxprt);
208    return -1;
209  }
210
211  return 0;			/* everything is ok */
212}
213