1/*
2 * Copyright (c) 1997-2006 Erez Zadok
3 * Copyright (c) 1990 Jan-Simon Pendry
4 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
5 * Copyright (c) 1990 The Regents of the University of California.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Jan-Simon Pendry at Imperial College, London.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 *    must display the following acknowledgment:
21 *      This product includes software developed by the University of
22 *      California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 *    may be used to endorse or promote products derived from this software
25 *    without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 *
39 *
40 * File: am-utils/libamu/misc_rpc.c
41 *
42 */
43
44/*
45 * Additions to Sun RPC.
46 */
47
48#ifdef HAVE_CONFIG_H
49# include <config.h>
50#endif /* HAVE_CONFIG_H */
51#include <am_defs.h>
52#include <amu.h>
53
54/*
55 * Some systems renamed _seterr_reply to __seterr_reply (with two
56 * leading underscores)
57 */
58#if !defined(HAVE__SETERR_REPLY) && defined(HAVE___SETERR_REPLY)
59# define _seterr_reply	__seterr_reply
60#endif /* !defined(HAVE__SETERR_REPLY) && defined(HAVE___SETERR_REPLY) */
61
62
63void
64rpc_msg_init(struct rpc_msg *mp, u_long prog, u_long vers, u_long proc)
65{
66  /*
67   * Initialize the message
68   */
69  memset((voidp) mp, 0, sizeof(*mp));
70  mp->rm_xid = 0;
71  mp->rm_direction = CALL;
72  mp->rm_call.cb_rpcvers = RPC_MSG_VERSION;
73  mp->rm_call.cb_prog = prog;
74  mp->rm_call.cb_vers = vers;
75  mp->rm_call.cb_proc = proc;
76}
77
78
79/*
80 * Field reply to call to mountd
81 */
82int
83pickup_rpc_reply(voidp pkt, int len, voidp where, XDRPROC_T_TYPE where_xdr)
84{
85  XDR reply_xdr;
86  int ok;
87  struct rpc_err err;
88  struct rpc_msg reply_msg;
89  int error = 0;
90
91  /* memset((voidp) &err, 0, sizeof(err)); */
92  memset((voidp) &reply_msg, 0, sizeof(reply_msg));
93  memset((voidp) &reply_xdr, 0, sizeof(reply_xdr));
94
95  reply_msg.acpted_rply.ar_results.where = where;
96  reply_msg.acpted_rply.ar_results.proc = where_xdr;
97
98  xdrmem_create(&reply_xdr, pkt, len, XDR_DECODE);
99
100  ok = xdr_replymsg(&reply_xdr, &reply_msg);
101  if (!ok) {
102    error = EIO;
103    goto drop;
104  }
105  _seterr_reply(&reply_msg, &err);
106  if (err.re_status != RPC_SUCCESS) {
107    error = EIO;
108    goto drop;
109  }
110
111drop:
112  if (reply_msg.rm_reply.rp_stat == MSG_ACCEPTED &&
113      reply_msg.acpted_rply.ar_verf.oa_base) {
114    reply_xdr.x_op = XDR_FREE;
115    (void) xdr_opaque_auth(&reply_xdr,
116			   &reply_msg.acpted_rply.ar_verf);
117  }
118  xdr_destroy(&reply_xdr);
119
120  return error;
121}
122
123
124int
125make_rpc_packet(char *buf, int buflen, u_long proc, struct rpc_msg *mp, voidp arg, XDRPROC_T_TYPE arg_xdr, AUTH *auth)
126{
127  XDR msg_xdr;
128  int len;
129  /*
130   * Never cast pointers between different integer types, it breaks badly
131   * on big-endian platforms if those types have different sizes.
132   *
133   * Cast to a local variable instead, and use that variable's address.
134   */
135  enum_t local_proc = (enum_t) proc;
136
137  xdrmem_create(&msg_xdr, buf, buflen, XDR_ENCODE);
138
139  /*
140   * Basic protocol header
141   */
142  if (!xdr_callhdr(&msg_xdr, mp))
143    return -EIO;
144
145  /*
146   * Called procedure number
147   */
148  if (!xdr_enum(&msg_xdr, &local_proc))
149    return -EIO;
150
151  /*
152   * Authorization
153   */
154  if (!AUTH_MARSHALL(auth, &msg_xdr))
155    return -EIO;
156
157  /*
158   * Arguments
159   */
160  if (!(*arg_xdr) (&msg_xdr, arg))
161    return -EIO;
162
163  /*
164   * Determine length
165   */
166  len = xdr_getpos(&msg_xdr);
167
168  /*
169   * Throw away xdr
170   */
171  xdr_destroy(&msg_xdr);
172
173  return len;
174}
175
176
177/* get uid/gid from RPC credentials */
178int
179getcreds(struct svc_req *rp, uid_t *u, gid_t *g, SVCXPRT *nfsxprt)
180{
181  struct authunix_parms *aup = (struct authunix_parms *) NULL;
182#ifdef HAVE_RPC_AUTH_DES_H
183  struct authdes_cred *adp;
184#endif /* HAVE_RPC_AUTH_DES_H */
185
186  switch (rp->rq_cred.oa_flavor) {
187
188  case AUTH_UNIX:
189    aup = (struct authunix_parms *) rp->rq_clntcred;
190    *u = aup->aup_uid;
191    *g = aup->aup_gid;
192    break;
193
194#ifdef HAVE_RPC_AUTH_DES_H
195  case AUTH_DES:
196    adp = (struct authdes_cred *) rp->rq_clntcred;
197    *g = INVALIDID;		/* some unknown group id */
198    if (sscanf(adp->adc_fullname.name, "unix.%lu@", (u_long *) u) == 1)
199        break;
200    /* fall through */
201#endif /* HAVE_RPC_AUTH_DES_H */
202
203  default:
204    *u = *g = INVALIDID;	/* just in case */
205    svcerr_weakauth(nfsxprt);
206    return -1;
207  }
208
209  return 0;			/* everything is ok */
210}
211