misc_rpc.c revision 119679 
1/*
2 * Copyright (c) 1997-2003 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 *      %W% (Berkeley) %G%
40 *
41 * $Id: misc_rpc.c,v 1.4.2.5 2002/12/29 00:46:43 ib42 Exp $
42 *
43 */
44
45/*
46 * Additions to Sun RPC.
47 */
48
49#ifdef HAVE_CONFIG_H
50# include <config.h>
51#endif /* HAVE_CONFIG_H */
52#include <am_defs.h>
53#include <amu.h>
54
55/*
56 * Some systems renamed _seterr_reply to __seterr_reply (with two
57 * leading underscores)
58 */
59#if !defined(HAVE__SETERR_REPLY) && defined(HAVE___SETERR_REPLY)
60# define _seterr_reply	__seterr_reply
61#endif /* !defined(HAVE__SETERR_REPLY) && defined(HAVE___SETERR_REPLY) */
62
63
64void
65rpc_msg_init(struct rpc_msg *mp, u_long prog, u_long vers, u_long proc)
66{
67  /*
68   * Initialize the message
69   */
70  memset((voidp) mp, 0, sizeof(*mp));
71  mp->rm_xid = 0;
72  mp->rm_direction = CALL;
73  mp->rm_call.cb_rpcvers = RPC_MSG_VERSION;
74  mp->rm_call.cb_prog = prog;
75  mp->rm_call.cb_vers = vers;
76  mp->rm_call.cb_proc = proc;
77}
78
79
80/*
81 * Field reply to call to mountd
82 */
83int
84pickup_rpc_reply(voidp pkt, int len, voidp where, XDRPROC_T_TYPE where_xdr)
85{
86  XDR reply_xdr;
87  int ok;
88  struct rpc_err err;
89  struct rpc_msg reply_msg;
90  int error = 0;
91
92  /* memset((voidp) &err, 0, sizeof(err)); */
93  memset((voidp) &reply_msg, 0, sizeof(reply_msg));
94  memset((voidp) &reply_xdr, 0, sizeof(reply_xdr));
95
96  reply_msg.acpted_rply.ar_results.where = (caddr_t) where;
97  reply_msg.acpted_rply.ar_results.proc = where_xdr;
98
99  xdrmem_create(&reply_xdr, pkt, len, XDR_DECODE);
100
101  ok = xdr_replymsg(&reply_xdr, &reply_msg);
102  if (!ok) {
103    error = EIO;
104    goto drop;
105  }
106  _seterr_reply(&reply_msg, &err);
107  if (err.re_status != RPC_SUCCESS) {
108    error = EIO;
109    goto drop;
110  }
111
112drop:
113  if (reply_msg.rm_reply.rp_stat == MSG_ACCEPTED &&
114      reply_msg.acpted_rply.ar_verf.oa_base) {
115    reply_xdr.x_op = XDR_FREE;
116    (void) xdr_opaque_auth(&reply_xdr,
117			   &reply_msg.acpted_rply.ar_verf);
118  }
119  xdr_destroy(&reply_xdr);
120
121  return error;
122}
123
124
125int
126make_rpc_packet(char *buf, int buflen, u_long proc, struct rpc_msg *mp, voidp arg, XDRPROC_T_TYPE arg_xdr, AUTH *auth)
127{
128  XDR msg_xdr;
129  int len;
130  /*
131   * Never cast pointers between different integer types, it breaks badly
132   * on big-endian platforms if those types have different sizes.
133   *
134   * Cast to a local variable instead, and use that variable's address.
135   */
136  enum_t local_proc = (enum_t) proc;
137
138  xdrmem_create(&msg_xdr, buf, buflen, XDR_ENCODE);
139
140  /*
141   * Basic protocol header
142   */
143  if (!xdr_callhdr(&msg_xdr, mp))
144    return -EIO;
145
146  /*
147   * Called procedure number
148   */
149  if (!xdr_enum(&msg_xdr, &local_proc))
150    return -EIO;
151
152  /*
153   * Authorization
154   */
155  if (!AUTH_MARSHALL(auth, &msg_xdr))
156    return -EIO;
157
158  /*
159   * Arguments
160   */
161  if (!(*arg_xdr) (&msg_xdr, arg))
162    return -EIO;
163
164  /*
165   * Determine length
166   */
167  len = xdr_getpos(&msg_xdr);
168
169  /*
170   * Throw away xdr
171   */
172  xdr_destroy(&msg_xdr);
173
174  return len;
175}
176
177
178/* get uid/gid from RPC credentials */
179int
180getcreds(struct svc_req *rp, uid_t *u, gid_t *g, SVCXPRT *nfsxprt)
181{
182  struct authunix_parms *aup = (struct authunix_parms *) NULL;
183#ifdef HAVE_RPC_AUTH_DES_H
184  struct authdes_cred *adp;
185#endif /* HAVE_RPC_AUTH_DES_H */
186
187  switch (rp->rq_cred.oa_flavor) {
188
189  case AUTH_UNIX:
190    aup = (struct authunix_parms *) rp->rq_clntcred;
191    *u = aup->aup_uid;
192    *g = aup->aup_gid;
193    break;
194
195#ifdef HAVE_RPC_AUTH_DES_H
196  case AUTH_DES:
197    adp = (struct authdes_cred *) rp->rq_clntcred;
198    *g = INVALIDID;		/* some unknown group id */
199    if (sscanf(adp->adc_fullname.name, "unix.%lu@", (u_long *) u) == 1)
200        break;
201    /* fall through */
202#endif /* HAVE_RPC_AUTH_DES_H */
203
204  default:
205    *u = *g = INVALIDID;	/* just in case */
206    svcerr_weakauth(nfsxprt);
207    return -1;
208  }
209
210  return 0;			/* everything is ok */
211}
212