summaryrefslogtreecommitdiff
path: root/sunrpc/rpc_prot.c
blob: b19dff7656aa59fb8f2aab3a29b0b92faecaf1b8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
/*
 * rpc_prot.c
 *
 * Copyright (c) 2010, Oracle America, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 *       copyright notice, this list of conditions and the following
 *       disclaimer in the documentation and/or other materials
 *       provided with the distribution.
 *     * Neither the name of the "Oracle America, Inc." nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 *   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 *   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 *   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 *   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This set of routines implements the rpc message definition,
 * its serializer and some common rpc utility routines.
 * The routines are meant for various implementations of rpc -
 * they are NOT for the rpc client or rpc service implementations!
 * Because authentication stuff is easy and is part of rpc, the opaque
 * routines are also in this program.
 */

#include <sys/param.h>

#include <rpc/rpc.h>

/* * * * * * * * * * * * * * XDR Authentication * * * * * * * * * * * */

/*
 * XDR an opaque authentication struct
 * (see auth.h)
 */
bool_t
xdr_opaque_auth (XDR *xdrs, struct opaque_auth *ap)
{

  if (xdr_enum (xdrs, &(ap->oa_flavor)))
    return xdr_bytes (xdrs, &ap->oa_base,
		      &ap->oa_length, MAX_AUTH_BYTES);
  return FALSE;
}
libc_hidden_nolink (xdr_opaque_auth, GLIBC_2_0)

/*
 * XDR a DES block
 */
bool_t
xdr_des_block (XDR *xdrs, des_block *blkp)
{
  return xdr_opaque (xdrs, (caddr_t) blkp, sizeof (des_block));
}
libc_hidden_nolink (xdr_des_block, GLIBC_2_0)

/* * * * * * * * * * * * * * XDR RPC MESSAGE * * * * * * * * * * * * * * * */

/*
 * XDR the MSG_ACCEPTED part of a reply message union
 */
bool_t
xdr_accepted_reply (XDR *xdrs, struct accepted_reply *ar)
{
  /* personalized union, rather than calling xdr_union */
  if (!xdr_opaque_auth (xdrs, &(ar->ar_verf)))
    return FALSE;
  if (!xdr_enum (xdrs, (enum_t *) & (ar->ar_stat)))
    return FALSE;
  switch (ar->ar_stat)
    {
    case SUCCESS:
      return ((*(ar->ar_results.proc)) (xdrs, ar->ar_results.where));
    case PROG_MISMATCH:
      if (!xdr_u_long (xdrs, &(ar->ar_vers.low)))
	return FALSE;
      return (xdr_u_long (xdrs, &(ar->ar_vers.high)));
    default:
      return TRUE;
    }
  return TRUE;		/* TRUE => open ended set of problems */
}
libc_hidden_nolink (xdr_accepted_reply, GLIBC_2_0)

/*
 * XDR the MSG_DENIED part of a reply message union
 */
bool_t
xdr_rejected_reply (XDR *xdrs, struct rejected_reply *rr)
{
  /* personalized union, rather than calling xdr_union */
  if (!xdr_enum (xdrs, (enum_t *) & (rr->rj_stat)))
    return FALSE;
  switch (rr->rj_stat)
    {
    case RPC_MISMATCH:
      if (!xdr_u_long (xdrs, &(rr->rj_vers.low)))
	return FALSE;
      return xdr_u_long (xdrs, &(rr->rj_vers.high));

    case AUTH_ERROR:
      return xdr_enum (xdrs, (enum_t *) & (rr->rj_why));
    }
  return FALSE;
}
libc_hidden_nolink (xdr_rejected_reply, GLIBC_2_0)

static const struct xdr_discrim reply_dscrm[3] =
{
  {(int) MSG_ACCEPTED, (xdrproc_t) xdr_accepted_reply},
  {(int) MSG_DENIED, (xdrproc_t) xdr_rejected_reply},
  {__dontcare__, NULL_xdrproc_t}};

/*
 * XDR a reply message
 */
bool_t
xdr_replymsg (xdrs, rmsg)
     XDR *xdrs;
     struct rpc_msg *rmsg;
{
  if (xdr_u_long (xdrs, &(rmsg->rm_xid)) &&
      xdr_enum (xdrs, (enum_t *) & (rmsg->rm_direction)) &&
      (rmsg->rm_direction == REPLY))
    return xdr_union (xdrs, (enum_t *) & (rmsg->rm_reply.rp_stat),
		      (caddr_t) & (rmsg->rm_reply.ru), reply_dscrm,
		      NULL_xdrproc_t);
  return FALSE;
}
libc_hidden_nolink (xdr_replymsg, GLIBC_2_0)


/*
 * Serializes the "static part" of a call message header.
 * The fields include: rm_xid, rm_direction, rpcvers, prog, and vers.
 * The rm_xid is not really static, but the user can easily munge on the fly.
 */
bool_t
xdr_callhdr (xdrs, cmsg)
     XDR *xdrs;
     struct rpc_msg *cmsg;
{

  cmsg->rm_direction = CALL;
  cmsg->rm_call.cb_rpcvers = RPC_MSG_VERSION;
  if (
       (xdrs->x_op == XDR_ENCODE) &&
       xdr_u_long (xdrs, &(cmsg->rm_xid)) &&
       xdr_enum (xdrs, (enum_t *) & (cmsg->rm_direction)) &&
       xdr_u_long (xdrs, &(cmsg->rm_call.cb_rpcvers)) &&
       xdr_u_long (xdrs, &(cmsg->rm_call.cb_prog)))
    return xdr_u_long (xdrs, &(cmsg->rm_call.cb_vers));
  return FALSE;
}
libc_hidden_nolink (xdr_callhdr, GLIBC_2_0)

/* ************************** Client utility routine ************* */

static void
accepted (enum accept_stat acpt_stat,
	  struct rpc_err *error)
{
  switch (acpt_stat)
    {

    case PROG_UNAVAIL:
      error->re_status = RPC_PROGUNAVAIL;
      return;

    case PROG_MISMATCH:
      error->re_status = RPC_PROGVERSMISMATCH;
      return;

    case PROC_UNAVAIL:
      error->re_status = RPC_PROCUNAVAIL;
      return;

    case GARBAGE_ARGS:
      error->re_status = RPC_CANTDECODEARGS;
      return;

    case SYSTEM_ERR:
      error->re_status = RPC_SYSTEMERROR;
      return;

    case SUCCESS:
      error->re_status = RPC_SUCCESS;
      return;
    }
  /* something's wrong, but we don't know what ... */
  error->re_status = RPC_FAILED;
  error->re_lb.s1 = (long) MSG_ACCEPTED;
  error->re_lb.s2 = (long) acpt_stat;
}

static void
rejected (enum reject_stat rjct_stat,
	  struct rpc_err *error)
{
  switch (rjct_stat)
    {
    case RPC_VERSMISMATCH:
      error->re_status = RPC_VERSMISMATCH;
      return;
    case AUTH_ERROR:
      error->re_status = RPC_AUTHERROR;
      return;
    default:
      /* something's wrong, but we don't know what ... */
      error->re_status = RPC_FAILED;
      error->re_lb.s1 = (long) MSG_DENIED;
      error->re_lb.s2 = (long) rjct_stat;
      return;
    }
}

/*
 * given a reply message, fills in the error
 */
void
_seterr_reply (struct rpc_msg *msg,
	       struct rpc_err *error)
{
  /* optimized for normal, SUCCESSful case */
  switch (msg->rm_reply.rp_stat)
    {
    case MSG_ACCEPTED:
      if (msg->acpted_rply.ar_stat == SUCCESS)
	{
	  error->re_status = RPC_SUCCESS;
	  return;
	};
      accepted (msg->acpted_rply.ar_stat, error);
      break;

    case MSG_DENIED:
      rejected (msg->rjcted_rply.rj_stat, error);
      break;

    default:
      error->re_status = RPC_FAILED;
      error->re_lb.s1 = (long) (msg->rm_reply.rp_stat);
      break;
    }
  switch (error->re_status)
    {

    case RPC_VERSMISMATCH:
      error->re_vers.low = msg->rjcted_rply.rj_vers.low;
      error->re_vers.high = msg->rjcted_rply.rj_vers.high;
      break;

    case RPC_AUTHERROR:
      error->re_why = msg->rjcted_rply.rj_why;
      break;

    case RPC_PROGVERSMISMATCH:
      error->re_vers.low = msg->acpted_rply.ar_vers.low;
      error->re_vers.high = msg->acpted_rply.ar_vers.high;
      break;
    default:
      break;
    }
}
libc_hidden_nolink (_seterr_reply, GLIBC_2_0)