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
63 void
rpc_msg_init(struct rpc_msg * mp,u_long prog,u_long vers,u_long proc)64 rpc_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 */
82 int
pickup_rpc_reply(voidp pkt,int len,voidp where,XDRPROC_T_TYPE where_xdr)83 pickup_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
111 drop:
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
124 int
make_rpc_packet(char * buf,int buflen,u_long proc,struct rpc_msg * mp,voidp arg,XDRPROC_T_TYPE arg_xdr,AUTH * auth)125 make_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 */
178 int
getcreds(struct svc_req * rp,uid_t * u,gid_t * g,SVCXPRT * nfsxprt)179 getcreds(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