1 /* $NetBSD: misc_rpc.c,v 1.1.1.3 2015/01/17 16:34:18 christos Exp $ */
2
3 /*
4 * Copyright (c) 1997-2014 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. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 *
38 * File: am-utils/libamu/misc_rpc.c
39 *
40 */
41
42 /*
43 * Additions to Sun RPC.
44 */
45
46 #ifdef HAVE_CONFIG_H
47 # include <config.h>
48 #endif /* HAVE_CONFIG_H */
49 #include <am_defs.h>
50 #include <amu.h>
51
52 /*
53 * Some systems renamed _seterr_reply to __seterr_reply (with two
54 * leading underscores)
55 */
56 #if !defined(HAVE__SETERR_REPLY) && defined(HAVE___SETERR_REPLY)
57 # define _seterr_reply __seterr_reply
58 #endif /* !defined(HAVE__SETERR_REPLY) && defined(HAVE___SETERR_REPLY) */
59
60
61 void
rpc_msg_init(struct rpc_msg * mp,u_long prog,u_long vers,u_long proc)62 rpc_msg_init(struct rpc_msg *mp, u_long prog, u_long vers, u_long proc)
63 {
64 /*
65 * Initialize the message
66 */
67 memset((voidp) mp, 0, sizeof(*mp));
68 mp->rm_xid = 0;
69 mp->rm_direction = CALL;
70 mp->rm_call.cb_rpcvers = RPC_MSG_VERSION;
71 mp->rm_call.cb_prog = prog;
72 mp->rm_call.cb_vers = vers;
73 mp->rm_call.cb_proc = proc;
74 }
75
76
77 /*
78 * Field reply to call to mountd
79 */
80 int
pickup_rpc_reply(voidp pkt,int len,voidp where,XDRPROC_T_TYPE where_xdr)81 pickup_rpc_reply(voidp pkt, int len, voidp where, XDRPROC_T_TYPE where_xdr)
82 {
83 XDR reply_xdr;
84 int ok;
85 struct rpc_err err;
86 struct rpc_msg reply_msg;
87 int error = 0;
88
89 /* memset((voidp) &err, 0, sizeof(err)); */
90 memset((voidp) &reply_msg, 0, sizeof(reply_msg));
91 memset((voidp) &reply_xdr, 0, sizeof(reply_xdr));
92
93 reply_msg.acpted_rply.ar_results.where = where;
94 reply_msg.acpted_rply.ar_results.proc = where_xdr;
95
96 xdrmem_create(&reply_xdr, pkt, len, XDR_DECODE);
97
98 ok = xdr_replymsg(&reply_xdr, &reply_msg);
99 if (!ok) {
100 error = EIO;
101 goto drop;
102 }
103 _seterr_reply(&reply_msg, &err);
104 if (err.re_status != RPC_SUCCESS) {
105 error = EIO;
106 goto drop;
107 }
108
109 drop:
110 if (reply_msg.rm_reply.rp_stat == MSG_ACCEPTED &&
111 reply_msg.acpted_rply.ar_verf.oa_base) {
112 reply_xdr.x_op = XDR_FREE;
113 (void) xdr_opaque_auth(&reply_xdr,
114 &reply_msg.acpted_rply.ar_verf);
115 }
116 xdr_destroy(&reply_xdr);
117
118 return error;
119 }
120
121
122 int
make_rpc_packet(char * buf,int buflen,u_long proc,struct rpc_msg * mp,voidp arg,XDRPROC_T_TYPE arg_xdr,AUTH * auth)123 make_rpc_packet(char *buf, int buflen, u_long proc, struct rpc_msg *mp, voidp arg, XDRPROC_T_TYPE arg_xdr, AUTH *auth)
124 {
125 XDR msg_xdr;
126 int len;
127 /*
128 * Never cast pointers between different integer types, it breaks badly
129 * on big-endian platforms if those types have different sizes.
130 *
131 * Cast to a local variable instead, and use that variable's address.
132 */
133 enum_t local_proc = (enum_t) proc;
134
135 xdrmem_create(&msg_xdr, buf, buflen, XDR_ENCODE);
136
137 /*
138 * Basic protocol header
139 */
140 if (!xdr_callhdr(&msg_xdr, mp))
141 return -EIO;
142
143 /*
144 * Called procedure number
145 */
146 if (!xdr_enum(&msg_xdr, &local_proc))
147 return -EIO;
148
149 /*
150 * Authorization
151 */
152 if (!AUTH_MARSHALL(auth, &msg_xdr))
153 return -EIO;
154
155 /*
156 * Arguments
157 */
158 if (!(*arg_xdr) (&msg_xdr, arg))
159 return -EIO;
160
161 /*
162 * Determine length
163 */
164 len = xdr_getpos(&msg_xdr);
165
166 /*
167 * Throw away xdr
168 */
169 xdr_destroy(&msg_xdr);
170
171 return len;
172 }
173
174
175 /* get uid/gid from RPC credentials */
176 int
getcreds(struct svc_req * rp,uid_t * u,gid_t * g,SVCXPRT * nfsxprt)177 getcreds(struct svc_req *rp, uid_t *u, gid_t *g, SVCXPRT *nfsxprt)
178 {
179 struct authunix_parms *aup = (struct authunix_parms *) NULL;
180 #ifdef HAVE_RPC_AUTH_DES_H
181 struct authdes_cred *adp;
182 #endif /* HAVE_RPC_AUTH_DES_H */
183
184 switch (rp->rq_cred.oa_flavor) {
185
186 case AUTH_UNIX:
187 aup = (struct authunix_parms *) rp->rq_clntcred;
188 *u = aup->aup_uid;
189 *g = aup->aup_gid;
190 break;
191
192 #ifdef HAVE_RPC_AUTH_DES_H
193 case AUTH_DES:
194 adp = (struct authdes_cred *) rp->rq_clntcred;
195 *g = INVALIDID; /* some unknown group id */
196 if (sscanf(adp->adc_fullname.name, "unix.%lu@", (u_long *) u) == 1)
197 break;
198 /* fall through */
199 #endif /* HAVE_RPC_AUTH_DES_H */
200
201 default:
202 *u = *g = INVALIDID; /* just in case */
203 svcerr_weakauth(nfsxprt);
204 return -1;
205 }
206
207 return 0; /* everything is ok */
208 }
209