misc_rpc.c revision 310490 
1/*
2 * Copyright (c) 1997-2014 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. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 *
36 * File: am-utils/libamu/misc_rpc.c
37 *
38 */
39
40/*
41 * Additions to Sun RPC.
42 */
43
44#ifdef HAVE_CONFIG_H
45# include <config.h>
46#endif /* HAVE_CONFIG_H */
47#include <am_defs.h>
48#include <amu.h>
49
50/*
51 * Some systems renamed _seterr_reply to __seterr_reply (with two
52 * leading underscores)
53 */
54#if !defined(HAVE__SETERR_REPLY) && defined(HAVE___SETERR_REPLY)
55# define _seterr_reply	__seterr_reply
56#endif /* !defined(HAVE__SETERR_REPLY) && defined(HAVE___SETERR_REPLY) */
57
58
59void
60rpc_msg_init(struct rpc_msg *mp, u_long prog, u_long vers, u_long proc)
61{
62  /*
63   * Initialize the message
64   */
65  memset((voidp) mp, 0, sizeof(*mp));
66  mp->rm_xid = 0;
67  mp->rm_direction = CALL;
68  mp->rm_call.cb_rpcvers = RPC_MSG_VERSION;
69  mp->rm_call.cb_prog = prog;
70  mp->rm_call.cb_vers = vers;
71  mp->rm_call.cb_proc = proc;
72}
73
74
75/*
76 * Field reply to call to mountd
77 */
78int
79pickup_rpc_reply(voidp pkt, int len, voidp where, XDRPROC_T_TYPE where_xdr)
80{
81  XDR reply_xdr;
82  int ok;
83  struct rpc_err err;
84  struct rpc_msg reply_msg;
85  int error = 0;
86
87  /* memset((voidp) &err, 0, sizeof(err)); */
88  memset((voidp) &reply_msg, 0, sizeof(reply_msg));
89  memset((voidp) &reply_xdr, 0, sizeof(reply_xdr));
90
91  reply_msg.acpted_rply.ar_results.where = where;
92  reply_msg.acpted_rply.ar_results.proc = where_xdr;
93
94  xdrmem_create(&reply_xdr, pkt, len, XDR_DECODE);
95
96  ok = xdr_replymsg(&reply_xdr, &reply_msg);
97  if (!ok) {
98    error = EIO;
99    goto drop;
100  }
101  _seterr_reply(&reply_msg, &err);
102  if (err.re_status != RPC_SUCCESS) {
103    error = EIO;
104    goto drop;
105  }
106
107drop:
108  if (reply_msg.rm_reply.rp_stat == MSG_ACCEPTED &&
109      reply_msg.acpted_rply.ar_verf.oa_base) {
110    reply_xdr.x_op = XDR_FREE;
111    (void) xdr_opaque_auth(&reply_xdr,
112			   &reply_msg.acpted_rply.ar_verf);
113  }
114  xdr_destroy(&reply_xdr);
115
116  return error;
117}
118
119
120int
121make_rpc_packet(char *buf, int buflen, u_long proc, struct rpc_msg *mp, voidp arg, XDRPROC_T_TYPE arg_xdr, AUTH *auth)
122{
123  XDR msg_xdr;
124  int len;
125  /*
126   * Never cast pointers between different integer types, it breaks badly
127   * on big-endian platforms if those types have different sizes.
128   *
129   * Cast to a local variable instead, and use that variable's address.
130   */
131  enum_t local_proc = (enum_t) proc;
132
133  xdrmem_create(&msg_xdr, buf, buflen, XDR_ENCODE);
134
135  /*
136   * Basic protocol header
137   */
138  if (!xdr_callhdr(&msg_xdr, mp))
139    return -EIO;
140
141  /*
142   * Called procedure number
143   */
144  if (!xdr_enum(&msg_xdr, &local_proc))
145    return -EIO;
146
147  /*
148   * Authorization
149   */
150  if (!AUTH_MARSHALL(auth, &msg_xdr))
151    return -EIO;
152
153  /*
154   * Arguments
155   */
156  if (!(*arg_xdr) (&msg_xdr, arg))
157    return -EIO;
158
159  /*
160   * Determine length
161   */
162  len = xdr_getpos(&msg_xdr);
163
164  /*
165   * Throw away xdr
166   */
167  xdr_destroy(&msg_xdr);
168
169  return len;
170}
171
172
173/* get uid/gid from RPC credentials */
174int
175getcreds(struct svc_req *rp, uid_t *u, gid_t *g, SVCXPRT *nfsxprt)
176{
177  struct authunix_parms *aup = (struct authunix_parms *) NULL;
178#ifdef HAVE_RPC_AUTH_DES_H
179  struct authdes_cred *adp;
180#endif /* HAVE_RPC_AUTH_DES_H */
181
182  switch (rp->rq_cred.oa_flavor) {
183
184  case AUTH_UNIX:
185    aup = (struct authunix_parms *) rp->rq_clntcred;
186    *u = aup->aup_uid;
187    *g = aup->aup_gid;
188    break;
189
190#ifdef HAVE_RPC_AUTH_DES_H
191  case AUTH_DES:
192    adp = (struct authdes_cred *) rp->rq_clntcred;
193    *g = INVALIDID;		/* some unknown group id */
194    if (sscanf(adp->adc_fullname.name, "unix.%lu@", (u_long *) u) == 1)
195        break;
196    /* fall through */
197#endif /* HAVE_RPC_AUTH_DES_H */
198
199  default:
200    *u = *g = INVALIDID;	/* just in case */
201    svcerr_weakauth(nfsxprt);
202    return -1;
203  }
204
205  return 0;			/* everything is ok */
206}
207